Theseus \th(e)-seus\ as a boy's name is of Greek origin. Mythology: the young hero who killed the Cretan Minotaur. He was the son of King Aegeus, who gave his name to the Aegean Sea around Greece. Theseus is featured in several classical Greek tragedies as well as in Chaucer's "Canterbury Tales" and Shakespeare's "Midsummer Night's Dream".

A baby name that sounds like Theseus is Dacius. Other similar baby names are Thadeus, Thonus, Jesus, Jesous and Thaddeus.