[solipsism]

Who in turn owes his name to Alexander II of Macedon.

[gohrt]

No, to Alexander I of Macedon.

Alexander II was Alexander (III) the Great's uncle.

[solipsism]

So what if he was his uncle? People are named after their uncles. Alexander II ruled well before the birth of Alexander III (during the boyhood of his father in fact) and would have been a perfectly logical namesake.