You could use Alexandros, as that is the original, and then call him Xandros
The name Alexander is comprised of two words: Ander/Andros (man) and Alex(...) meaning protector or defender.
Alexander, originally from the Greek Ἀλέξανδρος (Aléxandros), from αλέξειν aléxein meaning "to ward off, keep off, turn away, defend, protect" and ἀνδρός andrós, genitive of ἀνήρ anḗr meaning "man". Meaning. "Defender, protector of man".