- (AU) Tregillgas
 - Outlines the origin and development of the this surname, originally spelled Tregilgas. - (AU) Tyzack
- Tyzack and Henzell family genealogy. Includes English Civil Registration databases.
- Tamplen / Tamplin
- Tarpey
- Devoted to the Tarpey family, based in Lexington, KY.
- Tarry / Maskell
- Tracing the Tarry and Maskell lines from the mid-eighteenth century.
- Tassin
- Tavendale
- Genealogy of David Tavendale from Aberdeenshire, Scotland.
- Taylor (1)
- Teague
- Also Tyack(e), Teage, Tigue, Tague, and Teg(g).
- Tegart
- Tenney
- Dedicated to those who came before, leaving a heritage and a name to be proud of.
- Terwilliger
- Generations of families from Holland to the West Coast of the U.S.
- Teskey
- For the genealogy of the Teskey family of Irish Palatine descent.
- Test
- Dedicated to descendants of John Test (1651-1706). Arrived in New Jersey as part of Fenwick Colony in 1675.
- Tevault
- Also Warren, Starks, Simpson, Slabaugh, and Hayden.
- Thacker
- Provides transcripts of archival documents, family portraits, locations, name origins, and more.
- Theriault
- History of the Acadian family in North America, with particular details of the Joseph T. Theriault family of the St. John River Valley.
- Thomas (2)
- Thomasson
- Thorn / Thorne
- Also Coutant.
- Throckmorton
- Tinsley
- Tir na nO'Gara
- Dedicated to Genealogy and History of the Irish Clan O'Gara.
- Titchenal
- From Martin Titchenor's arrival in 1644 through the westward expansion to the global village of today, 13 generation of Titchenals have participated in United States history.
- Titterton
- Anyone interested in the surname's history should find this site of interest.
- Tompkins
- Also including the surnames: Nill, Muter, Wick, Riddle, Fish, Haddox, Bindon, and Vossler.
- Toney
- For researchers of the "Toney" surname to exchange GEDCOM files, links and any other information that might be useful to others in tracing the Toney family tree.
- Tonge (1)
- Tonsing / Bernard
- Also researching Toensing, Walker, Martin, Challiss, Pittenger, Patterson, Farmer, Thompson, Ford, Damron, and other surnames.
- Tooker
- Genealogy collective for the Tooker/Tucker clan.
- Tootell
- An effort to link the histories of this surname.
- Toothaker (1)
- Tormey
- Collection of historical articles and genealogical information on the Tormey surname.
- Toscani
- Devoted to all the people who carry the surname.
- Touzel
- Examines the family roots, history, and people.
- Townsend
- Dedicated to the preservation and research of American history, particularly as it pertains to the Townsend family.
- Travis
- Dedicated to the descendants of Murray and Dinah Travis, especially their sons William H. and Murray A. Travis.
- Treadway
- Treadwell / Tredwell
- Tremble / Sawyer
- Includes: Trimble, Trembly, Radley, Richardson, Laws, Jones, Dunham, and Noe.
- Trethowan
- Truax / DuTrieux
- Family history since Philippe imigrated in 1624, with two coat of arms and diagrams over five generations.
- Trulsas
- Family which originates from the Sweden.
- Tullio / Gardom
- Offering family histories and requesting any additional information.
- Turford
- Dedicated to the tracking and linking with Turfords around the world.
- Turk / Turc / Turck
- Also Turcq and Turque.
- Turner (4)
- Turteltaub
- History of the Turteltaub, Turkeltaub, Tarkeltaub, Turell, and Turtledove surnames.
- Tuttle
- Dedicated to the descendants of J.M. Tuttle and Alice Idella (Purinton) Tuttle.
- Tyler
- Researching the descendants of John Tyler in New England from the 18th Century to the present.
- Tynes
- History and genealogy.
- Tyree
- Contains family trees for several Tyree families.
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