The boy's name Theodosius\the(o)-do-sius\ is a variant of Theodore (Greek), and the meaning of Theodosius is "God's gift".
The baby name Theodosius sounds like Theodosios. Another similar baby name is Theodorus.
Theodosius is a very rare male first name and is not used as a surname (source: 1990 U.S. Census). Displayed below is the baby name popularity trend for the boy's name Theodosius. Compare Theodosius with related baby names.