| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 1721 | Tevin | Irish | Variant of the word 'teeve' meaning hillside. | M | |
| 1722 | Tevis | Irish | Variant of the word 'teeve' meaning hillside. | M | |
| 1723 | Thurl | Irish | Strong fort. | M | |
| 1724 | Thurle | Irish | Strong fort. | M | |
| 1725 | Tiarchnach | Irish | Regal. | M | |
| 1726 | Tibbot | Irish | Irish form of Theobald. | M | |
| 1727 | Tier | Irish | Regal. | M | |
| 1728 | Tiernan | Irish | Regal. | M | |
| 1729 | Tierney | Irish | Regal. | M | |
| 1730 | Tighe | Irish | Handsome. Variant of Teague. | M | |
| 1731 | Tighearnach | Irish | Regal. | M | |
| 1732 | Tipper | Irish | Nickname and variant of the Irish name Tabar meaning a well. | F | |
| 1733 | Tipper | Irish | Nickname and variant of the Irish name Tabar meaning a well. | M | |
| 1734 | Toireasa | Irish | Strong. | F | |
| 1735 | Tor | Irish | Variant of Torrence: from the craggy hills. Tor is a name for a craggy hilltop and also may refer to a watchtower. | M | |
| 1736 | Toran | Irish | Variant of Torrence: from the craggy hills. | M | |
| 1737 | Torean | Irish | Variant of Torrence: from the craggy hills. | M | |
| 1738 | Toren | Irish | Variant of Torrence: from the craggy hills. | M | |
| 1739 | Torence | Irish | Variant of Torrence: from the craggy hills. | M | |
| 1740 | Torey | Irish | From the craggy hills. | M | |