*Teresa, Theresa, Therese (f) - St Therissus (or Thyrsus), bishop of Karpasia, Cyprus ([[July 23]] - '''Derivative''')
*Tess (f) - ''see Teresa'' ('''Diminutive''')
*Theon (m) - St Theion, martyr ([[February 1]] - '''Saint''')
*Thierry (m) - ''see Derek'' ('''Saint''')
*Thomas (m) - [[Apostle Thomas]] ('''Saint''')
*Tyler (m) - St Tillo of Belgium ([[January 7]] - '''Sound-alike''') [http://www.orthodoxengland.org.uk/saintst.htm]
*Tyrone (m) - ''see Owen'' ('''Saint''')
*Tyrion (m) - St [[Tikhon]], St [[Tiridates of Armenia]] ([[November 29]]), St Taurion ([[November 7]]), Turiav ([[July 13]]) ('''Sound-alike''') [http://www.christopherklitou.com/when_is_my_nameday_t.htm] [http://www.orthodoxengland.org.uk/saintst.htm]
*Tyson (m) - St Dyfan of Britain ([[May 26]] - '''Sound-alike''') [http://www.orthodoxengland.org.uk/saintst.htm]