Latinized form of the Greek name
Θεοδοσιος (Theodosios) which meant "giving to god", derived from
θεος (theos) "god" and
δοσις (dosis) "giving". Saint Theodosius of Palestine was a monk who founded a monastery near Bethlehem in the 5th century. This also was the name of emperors of the Eastern Roman and Byzantine Empires.