Where does “Maksym” come from?

Maksym (Polish) comes from Latin Maximus, from Proto-Italic *magisVmos.

Ancestry of “Maksym”, step by step

StepLanguageWordMeaning
1LatinMaximusthe greatest
2Proto-Italic*magisVmos
Every word from Proto-Italic *magisVmosEvery word from Latin Maximus
Maksym — Etymology, Origin & Word History | Etymology Explorer