| Swale | A low or marshy tract of land |
| Swatreband | Derived from Old English, possibly meaning 'swart' or 'dark band' |
| Swayne | A young man or an attendant |
| Sweppi | Old Norse name, meaning 'sweeper' or 'one who sweeps' |
| Sweting | Possibly derived from 'sweet' or 'swete', a term of endearment. |
| Sweyn | Young Man or Warrior |
| Swidhelm | Old English name meaning 'battle shield' or 'warrior's protection'. |
| Tada | Japanese name meaning 'festival' or 'celebration'. |
| Tadan | A name meaning wise or intelligent. |
| Taebba | Possibly derived from 'taebba', a Gaelic name meaning 'strong' or 'brave'. |
| Taeppa | Possibly derived from 'taeppa', a Gaelic name meaning 'wise' or 'intelligent'. |
| Taesa | Possibly derived from 'taesa', a Gaelic name meaning 'wise' or 'intelligent'. |
| Taeta | Possibly derived from 'taeta', a Gaelic name meaning 'strong' or 'brave'. |
| Taetel | Possibly derived from 'taetel', a Gaelic name meaning 'strong' or 'brave'. |
| Taetwa | Possibly derived from 'taetwa', a Gaelic name meaning 'strong' or 'brave'. |
| Taitum | Possibly derived from 'taitum', a Gaelic name meaning 'strong' or 'brave'. |
| Takarra | Aboriginal Australian name meaning 'strong' or 'brave'. |
| Talebot | Old English name meaning 'people of the valley' or 'valley dweller'. |
| Taliessin | Welsh name meaning 'generous' or 'bountiful'. |
| Tallwch | Welsh name meaning 'foreigner' or 'stranger'. |
| Talore | Possibly derived from 'talore', a Gaelic name meaning 'strong' or 'brave'. |
| Tanar | A name meaning son of the thunder. |
| Tancorix | Possibly derived from 'tancorix', a Gaelic name meaning 'strong' or 'brave'. |
| Tandy | Manly; Virility; Brave |
| Tannur | A name meaning a baker of bread. |
| Tantan | Town by the Still River |
| Tantris | Possibly derived from 'tantris', a Gaelic name meaning 'strong' or 'brave'. |
| Tasciovanus | Roman name meaning 'son of the god' or 'divine son'. |
| Tathere | Possibly derived from 'tathere', a Gaelic name meaning 'strong' or 'brave'. |
| Tatton | Possibly derived from 'tatton', a place name in England meaning 'tun' or 'enclosure'. |
| Tatuini | From the Latin 'tatuini,' possibly meaning 'of the Tatui people' or 'from Tatui.' |
| Tatwine | Derived from the Old English 'tadwine,' meaning 'warrior' or 'battle-friend.' |
| Tatwulf | Old English name 'Tatwulf,' meaning 'warrior wolf' or 'battle wolf.' |
| Taulard | Possibly derived from the Old French 'taulard,' meaning 'tailor' or 'seamster.' |
| Taulas | Latin name 'Tulas,' possibly meaning 'from Tula' or 'of Tula.' |
| Tauleas | Derived from the Old French 'tauleas,' meaning 'tailor' or 'seamster.' |
| Taximagulus | Latin name 'Taximagulus,' meaning 'tax collector' or 'public official.' |
| Taytum | Possibly derived from the Old English 'tætum,' meaning 'gift' or 'treasure.' |
| Tchad | Protector Defender |
| Tecguaret | Latin name 'Tecguaret,' possibly meaning 'of the Tecguari people' or 'from Tecguari.' |