| Tara | Irish | Transferred use of the Irish place-.. |  |  |
| Teadoir | Irish | Gaelic form of Theodore (God's gift.. |  | |
| Teamhair | Irish | Gaelic form of Tara (hill). See TA.. | | |
| Teige | Irish | Anglicized form of Tadhg (poet, phi.. |  | |
| Terence | Irish | A borrowing from the English, Teren.. |  | |
| Teresa | Irish | Of uncertain etymology, Teresa is g.. | | |
| Thaddeaus | Irish | Latin name from the Ecclesiastic Gr.. | | |
| Theodore | Irish | From the Latin Theodorus, which is .. | | |
| Thom | Irish | A short form of Thomas (a twin), Th.. | | |
| Thomas | Irish | From the Ecclesiastic Greek Thomas,.. | | |
| Tiamhdha | Irish | Irish form of Timothy (honor God, r.. | | |
| Tiarnach | Irish | Anglicized form of Tighearnach (lor.. | | |
| Tiernan | Irish | Anglicized spelling of Tiarnan and .. | | |
| Tierney | Irish | Anglicized form of Tighearnach (lor.. | | |
| Tighearnach | Irish | Derived from tighearna (a lord). Th.. | | |
| Tighearnan | Irish | Derived from the diminutive form of.. | | |
| Tigris | Irish | Derived from the Latin tigris (tige.. | | |
| Timothy | Irish | Derived from the French Timothee, w.. | | |
| Tina | Irish | A short form of Christina (a Christ.. | | |
| Tiomoid | Irish | Irish form of Timothy (honor God, r.. | | |
| Tipper | Irish | Meaning "water pourer," this name h.. | | |
| Toal | Irish | Anglicized form of Tuathal (people .. | | |
| Toirdealbhach | Irish | Old Irish name meaning "shaped .. | | |
| Toireasa | Irish | Gaelic form of Teresa, a name of un.. | | |
| Tomaisin | Irish | Diminutive form of Tomas, the Irish.. | | |
| Tomas | Irish | Common Irish form of Thomas (a twin.. | | |
| Torin | Irish | Meaning "chief." | | |
| Tormey | Irish | Meaning "thunder spirit."
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| Treasa | Irish | A name meaning "strength" and an I.. | | |
| Treise | Irish | Irish name meaning "strength." | | |
| Trevina | Irish | Meaning "prudent."
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| Troy | Irish | Meaning "foot soldier." The name wa.. | | |
| Troya | Irish | Meaning "foot soldier." | | |
| Tuathal | Irish | Ancient name derived from the Celti.. | | |
| Tullia | Irish | A name that means "peaceful; quiet... | | |
