Where does “Максим” come from?

Максим (Macedonian) comes from Latin Maximus, from Proto-Italic *magisVmos.

Ancestry of “Максим”, step by step

StepLanguageWordMeaning
1LatinMaximusthe greatest
2Proto-Italic*magisVmos
Every word from Proto-Italic *magisVmosEvery word from Latin Maximus