Ἰσίδωρος (Ancient Greek) comes from Ancient Greek δῶρον, from Proto-Hellenic dṓron, from Proto-Indo-European déh₃rom, from Proto-Indo-European deh₃- — to give.
Ancestry of “Ἰσίδωρος”, step by step
Ἰσίδωρος traces back through two separate lines of ancestry.