Taghadoe in Kildare; Teach-Tuae [Taghtoo], F.M., the house of St.Tua.
Taghboy; yellow house.
Taghmon in Wexford; written in the Book of Leinster Teach-Munna [Taghmunna], the house of St. Munna or Fintan, who founded a monastery there, and died in A.D. 634.
Tallaght in Dublin; Taimhleacht [Tavlaght], a plague monument. According to the bardic legend, 9000 of Parthalon’s people died of the plague, and were buried in this place, which was therefore called the Taimhleacht or plague grave of Parthalon’s people.
Tamlaght, Tamlat; a plague grave; same as Tallaght.
Tamagh, Tamny; Tamhnach, a groom field.
Tanderagee; a corruption of Tóin-re-gaeith [Tonregee], backside to the wind. See Tonlegee.
Tara; Teamhair [Tawer], F.M., a residence on an elevated spot, commanding an extensive view. There are many places of this name in Ireland, besides the celebrated Tara in Meath.
Tarmon; the same as Termon.
Tat, Tate, Tath; a measure of land.
Tattygare; short tate or land measure.
Taughboyne in Donegal; Tech-Baeithin [Taghbwee-heen], O’C.Cal., the house of St. Baeithin; he was a companion of St. Columkille, and governed the monastery of Iona after that saint’s death. Died in A.D. 600.
Tavanagh, Tavnagh; Tamhnach, a green field.
Tawlaght; a plague monument. See Tallaght.
Tawnagh, Tawny; Tamhnach, a green field.
Tawnaghmore; great field.
Tecolm in Queen’s County; Tigh-Choluim [Teecolum] St. Colmkille’s house.
Teebane; Tigh-bán [Teebaun], white house.
Teemore; great house (tigh).
Teev, Teeve; Taebh, the side, a hill side.
Teltown on the Blackwater in Meath. Lewy of the long hand, one of the Tuatha De Danann kings, established a fair or gathering of the people, to be held here yearly on the first of August, in which games, pastimes, and marriages were celebrated; and in honour of his foster mother Taillte [Telta], he called the place Tailltenn [Teltenn], now modernized to Teltown.
Temple; Teampuill, a church.
Templeachally in Tipperary; the church of the cala or marshy meadow.
Templebredon in Tipperary; O’Bredon’s church.
Templebreedy; St. Brigid’s church.
Templecarn in Donegal; the church of the carn or monument.
Ternple-etney in Tipperary; St. Eithtne’s church.
Templemichael; the church of the Archangel Michael.
Templemolaga in Cork; the church of St. Molaga, a native of Fermoy, who died on the 20th of January, some short time before the year 664.
Templemore; great church; a cathedral.
Templemoyle; bald or dilapidated church (mael).
Templenacarriga; the church of the rock.
Templenoe, Templenew; Teampull-nua, new church.
Templepatrick; St. Patrick’s church.
Templeport; the church of the port or bank.
Templeshanbo in Wexford. Ancient pagan name Sean-both-Sine [Shanboh-Sheena], Sin’s or Sheen’s old tent or hut; and in Christian times, after a church had been erected there, the present name was formed by the addition of the word Temple to Seanboth: Templeshanbo, the church of Seanboth.
Templetogher in Galway; the church of the causeway (tóchar), from a celebrated old togher across a bog.
Templetuohy in Tipperary; the church of the tuath or territory, because it was the principal church of the district.
Tempo in Fermanagh; shortened from the full Irish name an t-Iompodh-deisiol [an Timpo deshill], the turning from left to right. Iompodh [impo] means turning; deisiol, right handed; and the article an prefixed takes a t in this case, which became incorporated with the word. The place received its name, no doubt, from the ancient custom of turning sun-ways in worship.
Terenure; Tir-an-iubhair, the land of the yew.
Termon; Tearmann, church land.
Termonfeckin; St. Fechin’s church land.
Terryglass in Tipperary; called in Irish authorities Tir-da-ghlas [Tir-ā-glas], which Adamnan in his Life of St. Columba translates Ager-duorurn-rivorum, the land of the two streams.
Thurles in Tipperary; Durlios [Durlas], strong lis or fort. In the annals it is commonly called Durlas-­O’Fogarty, from the O’Fogartys, the ancient proprietors of the surrounding district. See Eliogarty.
Tiaquin, barony of, in Galway; shortened from Tigh-Daconna [Tee-āconna], F.M., St. Dachonna’s house.
Tibberaghny in Kilkenny: Tiobrad-Fachtna [Tibbrad­aghna], F.M., St. Faghna’s well.
Tibohine in Roscommon; Tech-Baeithin (O’C.Cal.), St. Baeithin’s house. The name is the same as Taugh­boyne, but this is a different Baeithin; he was of the race of Enda, son of Niall of the Nine Hostages, and was one of the ecclesiastics to whom the apostolic letter was written in the year 640, on the subject of the time for celebrating Easter.
Tieve; Taebh [teeve], a side, a hill-side.
Tievebrack; speckled hill-side.
Tiglin in Wicklow; the house of the glen.
Tiknock, Ticknock, Ticknick; Tigh-cnuic [Ticknick], the house of the hill.
Timahoe in Queen’s County; Tech-Mochua [Tee-Mohua], O’C.Cal., the house of St. Machua, the original founder and patron, who flourished in the sixth century.
Timogue in Queen’s County; St. Mogue’s house.
Timoleague in Cork; Teach-Molaga, F.M., Molaga’s house, from St. Molaga of Templemolaga.
Timolin in Kildare; Tigh-Moling [Tee-Moling], St. Moling’s house, from a church erected there by St. Moling of St. Mullins.    
Tinamuck; Tigh-na-rnuc, the house of the pigs.
Tincurragh, Tincurry; Tigh-an-churraigh [Tincurry], the house of the currach or marsh.
Tinnahinch, Tinnehinch; Tigh-na-hinnse [Tee-na-hinsha], the house of the island or river meadow.
Tinnakill, Tinnakilly; the house of the church or wood.
Tinnascart, Tinnascarty; the house of the cluster or thicket (scairt).
Tinnick, Tinnock, Tinock; same as Tiknock.
Tipper; a form of Tobar, a well.
Tipperary; Tiobraid-Arann [Tibrad-Auran], F.M., the well of Ara, the ancient territory in which it was situated. The well that gave its name to the town and thence to the county, was situated in the Main-street, but it is now closed up.
Tipperkevin in Kildare; St. Kevin’s well.
Tipperstown in Dublin and Kildare; a half translation from Baile-an-tobair [Ballintubber], the town of the well.
Tiranascragh in Galway; Tir-an-eascrach, the land of the esker or sand hill.
Tirawly, barony of, in Mayo; Tir-Amalgaidh [Awly], the land or district of Amhalgaidh, king of Connaught, brother of the monarch Dathi, and son of Ohy Moy­vane, king of Ireland from A.D. 358 to 365.
Tirconnell, the ancient name of Donegal; Tir-Conaill, the land or district of Conall Gulban, son of Niall of the Nine Hostages.
Tireragh, barony of, in Sligo; Tir-Fhiachrach [Tir­eeragh], F.M., the district of Fiachra, son of Dathi, and grandson of Ohy Moyvane. See Tirawly.
Tirerrill, barony of, in Sligo; Tir-Oiliolla [ollila], Hy F., the district of Olioll, son of Ohy Moyvane (see Tirawly). L changed to r.
Tirkeeran, barony of, in Derry; Tir-Chaerthainn [Tir­keerhin], the district of Kieran, the great grandson of Colla Uais, brother of Colla Meann. See Cremorne.
Tisaran in King’s County; from an old church which is called in the Calendars Teach-Sarain [Tasaran], the house of St. Saran, the founder, who was of the race of the Dealbhna. See Delvin.
Tisaxon; the house of the Saxons or Englishmen.
Tiscoffin in Kilkenny; from an old church called Tigh-scoithin [Tee Scoheen], the house of St. Scoithin, who erected his primitive church here towards the close of the sixth century.
Tober; Tobar, a well.
Toberaheena; the well of Friday (aeine, pron. eena); from the custom of visiting the well and performing devotions on Friday.
Toberbilly; the well of the ancient tree (bilě).
Tobercurry in Sligo; written by Mac Firbis, Tober-an-choire, the well of the caldron or pit.
Tobermore; great well.
Toberrendoney in various counties; Tobar-righ-an­domhnaigh [Toberreendowny], the well of the king of Sunday (i.e. of God); these wells were so called because they were visited on Sunday.
Togher; Tóchar, a causeway.
Tomdeely in Limerick; the tumulus (tuaim) of the river Deel.
Tomfinlough in Clare; Tuaim-Fionnlocha, F.M., the tumulus of the bright lake (fionn, bright, clear); from an old church by a lake near Sixmile-bridge.
Tomgraney in Clare; Tuaim-greine [Toomgraney], F.M., the tumulus of the lady Grian, about whom there are many traditions.
Tomies mountain over the lower lake of Killarney; Tumaidhe [Toomy], tumuli or monumental mounds; from two sepulchral heaps on the top of the mountain.
Tomregan in Cavan; Tuaim-Drecon [Toom-reckon: D aspirated], F.M., Drecon’s burial mound.
Tonagh; Tamhnach [Townagh], a field.
Tonbane, Tonbaun; white tóin or backside.
Tonduff; black backside (tóin).
Tonlegee; Tóin-le-gaeith, backside to the wind.
Tonnagh; a mound or rampart.
Tonregee; same as Tanderagee and Tonlegee.
Tonroe; red backside.
Tooman; Tuaman, a small tumulus.
Toome, Toom; Tuaim, [Toom], a tumulus or burial mound.
Toomore, Toomour; Tuaim-dha-bhodhar [Toom-ā-wour], F.M., the tumulus of the two deaf persons.
Toomyvara in Tipperary, exactly represents the sound of the Irish Tuaim-ui-Mheadhra, the tumulus or tomb of O’Mara.
Toor; Tuar, a bleach green or drying place.
Toorard; high bleach green.
Tooreen; little bleach green.
Toormore; great bleach green.
Toortane, Toortaun; Tortan, a small hillock.
Tor; a tower, a tall tower-like rock.
Torc mountain at Killarney; the mountain of the torcs or boars.
Tormore; great tower or tower-like rock.
Tory island off the coast of Donegal; Torach (Wars of G.G.), towery, i.e. abounding in tors or tower-like rocks.
Touaghty in Mayo; Tuath-Aitheachta [Thoo-ahaghta], Hy.F., the tuath or district of the attacotti or plebeians, i.e. the races vanquished and enslaved by the Milesians.
Tourin; little bleach green; same as Tooreen.
Tralee; Traigh-Li [Tralee], F.M., the strand of the Lee, a little river which runs into the sea at the town, but which is now covered over.
Tramore; Traigh-mor, great strand.
Trean, Trien; Trian, a third part.
Treanbaun; white third.
Treanboy; yellow third.
Treanlaur; middle third (lár, middle).
Treanmanagh; middle third (rneadhonach).
Trevet in Meath; Trefoit [Trefote], F.M., three fods or sods; so named, according to the Leabhar-na-huidhre, because when Art, the son of Conn of the Hundred Battles was buried there, three sods were dug over his grave in honour of the Trinity.
Trillick; Tri-liag, three liags or pillar stones.
Trim in Meath; full name Ath-truim [Ah-trim], the ford of the elder bushes.
Tromaun; a place producing elder bushes (trom).
Trough, barony of, in Monaghan; Triucha [Truha], a cantred or district.
Trumman, Trumrnery; same as Tromaun.
Tuam in Galway; Tuaim-da-ghualann [Tuam-a-woolan], the tumulus of the two shoulders, from the shape of the old sepulchral mound that gave name to the place.
Tubbrid; same as Tober; a well.
Tulla, Tullach; Tulach, a little hill.
Tullaghan; a little tulach or hill.
Tullaghmelan in Tipperary; Moylan’s hill.
Tullahogue in Tyrone; Tulach-og, F.M., the hill of the youths.
Tullahaught in Kilkenny; Tulach-ocht, the hill of the eight (persons).
Tullamore; great hill; same as Tullymore.
Tullig; another form of Tulach, a hill.
Tullow; Tulach, a little hill.
Tullowphelim, a parish containing the town of Tallow in Carlow; contracted from Tullow-offelimy, the tulach or hill of the territory of the Hy Felimy, a tribe descended and named from Felimy, son of Enna Kinsella, king of Leinster in the fourth century.
Tully; a little hill; same as Tulla.
Tullyallen; Tulaigh-áluinn [Tullyaulin], beautiful hill.
Tullyard; high hill.
Tallybane, Tallybaun; Tulaigh-bán, white hill.
Tullybeg; little tulach or hill.
Tullycorbet; the hill of the chariot (carbad).
Tullyglass; green hill.
Tullyhaw, barony of, in Cavan; so called from the Magaurans, its ancient proprietors, whose tribe name was Tealach-Echach [Tulla-eha: O’Dugan], the family of Eochy or Ohy.
Tullylease in Cork; Tulach-leas [Tullaleese], the hill of the huts.
Tullymongan at Cavan; Tulach-Mongain, F.M., Mongan’s hill.
Tullymore; great hill; same as Tullamore.
Tullynacross; the hill of the cross.
Tullynagardy near Newtownards; Tulaigh-na-gceardcha, the hill of the forges.
Tullynakeagh; the hill of the white thorns.
Tullynure; Tulach-an-iubhair, the hill of the yew.
Tullyroe; red hill.
Tullyrusk in Antrim: the hill on which the old church stands, was surrounded by marshy ground; hence the name, which Colgan writes Tulach-ruisc, the hill of the morass. See Rusk.
Tullytrasna; cross or transverse hill.
Tumna in Roscommon; Tuairn-mna, F.M., the tomb of the woman (bean, gen. mna).
Tuosist in Kerry; Tuath-O’Siosta [O’Sheesta], O’Siosta’s territory.
Ture; the yew. The word iubhar [yure] has incorporated the t of the article, like Tempo.
Turlough; a lake that dries up in summer.
Twelve Pins, a remarkable group of mountains in Connemara ; should have been called the Twelve Bens, i.e. peaks. Sometimes called “The Twelve Pins of Bunnabola,” in which the word beann occurs twice; for Bunnabola is Beanna-Beola [Banna-Bola], the peaks of Beola, an old Firbolg chief, who is still remembered in tradition. See Mourne.
Tyfarnham in Westmeath; Farannan’s house (tigh); the same person that gave name to Multyfarnham.
Tyone in Tipperary; Tigh-Eóin, John’s house.
Tyrella in Down; Tech-Riaghla [Tee-Reela], O’C.Cal. the house of St. Riaghal [Reeal] or Regulus.
Tyrone. The descendants of Eoghan [Owen], son of Niall of the Nine Hostages, possessed the territory extending over the counties of Tyrone and Derry and the two baronies of Raphoe and Inishowen in Donegal; all this district was anciently called Tir-Eoghain [Tir-Owen: Wars of GG.], Owen’s territory, which is now written Tyrone, and restricted to one county. See Inishowen.