- Townsend (continued)
- Towsley
- Tracewell
- Tracey
- Tracy
- Trafford
- Train
- Trainor
- Tran
- Tranfield
- Trapp
- Trask
- Traver
- Treadway
- Treadwell
- Treat
- Tredwell
- Trees
- Trego
- Trelow
- Tremain
- Tremrow
- Trench
- Trenk
- Trethewey
- Trevett
- Trevillian
- Trevor
- Trevor ap Dafydd ab Ednyfed Gam
- Treybal
- Trickett
- Trim
- Trinklein
- Tripp
- Tritton
- Trobock
- Trombley
- Trott
- Trotter
- Trout
- Troutbeck
- Troutman
- Trow
- Trowbridge
- Troy
- Troyer
- Trubenbach
- Trudeau
- Trudell
- True
- Trueblood
- Truesdale
- Truesdell
- Truman
- Trumble
- Trumbull
- Trundy
- Trupp
- Tryon
- Tsatsis
- Tubbs
- Tubman
- Tuchirello
- Tuck
- Tucker
- Tudor