Ones on my list:
[name_f]Thea[/name_f]
[name_f]Theodora[/name_f]
[name_f]Theodosia[/name_f]
[name_f]Tansy[/name_f]
Tamsyn/Tamsin
[name_m]Theo[/name_m]
[name_m]Theodore[/name_m]
[name_m]Tobin[/name_m]
[name_m]Thomas[/name_m]
[name_m]Tristan[/name_m]
[name_m]Theon[/name_m]
Some of my favorites are:
[name_m]Txomin[/name_m]
Tasiko
Taís
[name_f]Tereza[/name_f], [name_f]Teresa[/name_f], [name_f]Thérèse[/name_f]
[name_m]Tomas[/name_m]
[name_f]Tatyana[/name_f]
[name_m]Tabassum[/name_m] (and Tabu)
Tatuli
I don’t tend to think about T names very often. Our last name starts with T and my husband vetoed using any T first names, so I think I just pushed them out of my mind as I knew they were unusable. But there are some nice gems that I do really like! Here’s my list, in no particular order:
[name_f]Tara[/name_f]
[name_f]Tatiana[/name_f]
[name_f]Thea[/name_f]
[name_f]Theodora[/name_f]
[name_f]Thora[/name_f]
[name_f]Tamsin[/name_f]
[name_f]Tatum[/name_f]
[name_f]Tamara[/name_f]
[name_f]Tamar[/name_f]
[name_f]Tess[/name_f]
[name_f]Therese[/name_f]
[name_f]Teresa[/name_f]
[name_f]Thalia[/name_f]
[name_f]Tallulah[/name_f]
[name_f]Temperance[/name_f]
[name_f]Torrance[/name_f]
[name_f]Tilde[/name_f]
[name_f]Tirzah[/name_f]
[name_f]Tova[/name_f]
[name_f]Tegan[/name_f]
[name_f]Tegwen[/name_f]
[name_f]Tasha[/name_f]
[name_f]Tigerlily[/name_f] (GP)
[name_m]Torsten[/name_m]
[name_m]Thaddeus[/name_m]
[name_m]Thomas[/name_m]
[name_m]Tavish[/name_m]
[name_m]Terrence[/name_m]
[name_m]Trevor[/name_m]
[name_m]Tate[/name_m]
[name_m]Teague[/name_m]
[name_m]Thane[/name_m]
[name_m]Thorin[/name_m]
[name_m]Toby[/name_m]
[name_m]Thierry[/name_m]
[name_m]Taran[/name_m], [name_m]Thatcher[/name_m], [name_m]Turner[/name_m], [name_m]Theodore[/name_m], [name_m]Tad[/name_m], [name_m]Theophilus[/name_m], [name_m]Thomas[/name_m], [name_f]Tilda[/name_f], [name_f]Tawny[/name_f], [name_f]Tempest[/name_f], [name_f]Tiffany[/name_f], [name_m]Teddy[/name_m]
Thanks everyone for all these T treasures 
Mine are:
[name_f]Tomine[/name_f]
[name_f]Tomyris[/name_f]
Te’eina
[name_f]Tosca[/name_f]
Tzufit
[name_f]Telma[/name_f] / [name_f]Thelma[/name_f]
Trú
[name_m]Thorne[/name_m]
[name_m]Till[/name_m]
Tzafrir
Thure
Tindri
Toviyah / Tuvye
Trausti
Tzemach
Tryggvi
[name_f]Taylor[/name_f]
[name_f]Teagan[/name_f]
[name_f]Tessa[/name_f]
[name_f]Thalia[/name_f]
[name_f]Tia[/name_f]
[name_f]Trinity[/name_f]
[name_m]Tanner[/name_m]
[name_f]Tatum[/name_f]
[name_m]Theo[/name_m]
[name_m]Thomas[/name_m]
[name_m]Toby[/name_m]
[name_m]Tristan[/name_m]
I forgot about [name_f]Trinity[/name_f].
For girls, I like [name_f]Theodosia[/name_f] (obviously)
For boys, I like [name_m]Theodore[/name_m], [name_m]Tucker[/name_m], & [name_m]Tate[/name_m]
[name_f]Tanith[/name_f]
[name_f]Tabitha[/name_f]
[name_f]Thea[/name_f]
[name_m]Thayer[/name_m]
[name_m]Tavis[/name_m]
[name_m]Thaddeus[/name_m]
I love [name_m]Thomas[/name_m], [name_m]Theo[/name_m] and [name_f]Thea[/name_f] 
[name_f]Tessa[/name_f] and [name_f]Tabitha[/name_f] ‘Tabby’ are lovely too!
[name_m]Hi[/name_m] there.
For girls I love [name_f]Tess[/name_f]. She’s such a sweet & sporty classy little gem.
I also like…
[name_f]Talia[/name_f]
[name_f]Tessa[/name_f]
[name_f]Thea[/name_f]
[name_f]Theodora[/name_f]
Kind of like [name_f]Tallula[/name_f], but only spelled that way.
[name_f]Tullia[/name_f] is okay, too. And [name_f]Tabitha[/name_f], but they’re not my favorite.
For boys, I’m not too excited about a lot of ‘T’ names. I do find [name_m]Theodore[/name_m] charming. He’s probably my favorite. The name of one of my nephews. I also really enjoy [name_m]Thomas[/name_m], but dislike the nns.
Others that I like a little bit are…
[name_m]Thaddeus[/name_m]
[name_m]Thatcher[/name_m]
[name_m]Timothy[/name_m]
[name_m]Tristan[/name_m]
[name_m]Tucker[/name_m]
[name_f]Hope[/name_f] this helps. 
[name_m]Toussaint[/name_m] 
a few favourites !! 
theseus
toivo
thomas / tomas / tomaž / tomáš / tuomas
tomislav
tatjana / tatyana
tuomi
tuija
théodore
tobin
txomin
tesni
tuuli / tuulikki
thelxinoë
taika
theonoë
thomaïs
tisiphone
[name_f]Teresa[/name_f], [name_f]Tessa[/name_f], and [name_f]Thérèse[/name_f]!
[name_f]Tatiana[/name_f]
[name_f]Theodora[/name_f]
[name_f]Tallulah[/name_f]
[name_m]Tadhg[/name_m]
[name_f]Thessaly[/name_f], Tullulah ‘Tully’, Thea/ Theadosia, [name_f]Trixie[/name_f], [name_m]Tobias[/name_m],
[name_f]Thalia[/name_f]
[name_f]Tess[/name_f]
[name_f]Theadora[/name_f]
[name_f]Tamara[/name_f]
[name_f]Tamsyn[/name_f]
[name_f]Tara[/name_f]
[name_m]Theodore[/name_m]
[name_m]Timothy[/name_m]
[name_m]Tristan[/name_m]
[name_m]Tyler[/name_m]
[name_m]Thomas[/name_m]
[name_m]Tyrone[/name_m]
I think Tiggy would currently qualify as my favourite T girl name , while Truman would take the cake for boys
I also love:
Thomas
Tadgh
Tiziano / Tiziana ( Italian )
Tatiana " Tati "
Tremaine
Theresa " Tessa "
Testimony " Tessa / Timmy "
Taura
Tulia
Trixie / Trisha / Trina - although those are all nicknames much like Tiggy
Travis
Trevor
Thomas
Thelonius
Tarquinius
Taj
Tariq
Toby / Tobias / Tobin
Tamara " Tammy / Mari "
Tameka
Tanisha
Tigerlily ( middle name only)
And many more which I can’t currently think of
[name_m]Tadhg[/name_m] 
Taeho 
[name_m]Taos[/name_m]
[name_m]Taggart[/name_m]
[name_m]Talmadge[/name_m]
Tamarlane
[name_f]Taylor[/name_f]
[name_m]Taz[/name_m]
Tazodor
[name_f]Teale[/name_f] 
Telluride
[name_m]Tenzin[/name_m]
[name_f]Tessa[/name_f] 
[name_m]Thackeray[/name_m]
[name_m]Theodore[/name_m]
[name_f]Thisbe[/name_f]
[name_f]Thistle[/name_f]
[name_m]Thor[/name_m]
[name_m]Thomas[/name_m]
Tianin
[name_m]Tiberius[/name_m]
[name_m]Tide[/name_m]
Tiegust
[name_m]Tiger[/name_m]
[name_m]Tiller[/name_m]
[name_m]Toby[/name_m]
Tolland
[name_m]Tolliver[/name_m]
[name_m]Truman[/name_m]
Tryggve
[name_m]Tuck[/name_m]
[name_f]Tuesday[/name_f]
[name_m]Tyler[/name_m]