Theo \the()-theo\ as a girl's name (also used as boy's name Theo),  is a variant of Theodora (Greek), and the meaning of Theo is "God's gift". 
The baby name Theo sounds like Thea, Thia, To, Tea, Te-, Theia and Thu. Other similar baby names are She-, Shea, Theda, Theta, Theone and Theoni.