Thomas \th(o)-mas\ as a boy's name is pronounced TAH-mas. It is of Aramaic origin, and the meaning of Thomas is "twin". Biblical: one of the 12 apostles known as "doubting Thomas" as he has an unusual mixture of pessimism and zealous faith. Some say his full name was Judas Thomas (Judas the Twin), and the nickname distinguished him from Judas Iscariot. The name has been popular since the 12th-century martyr Thomas