Where does “marcus” come from?

marcus (Dalmatian) comes from Vulgar Latin (a)maricosus, from Latin amārus, from Proto-Indo-European h₂eh₃mós, from Proto-Indo-European h₂eh₃- — to be hot; to burn.

marcus (Dalmatian): bitter

Definitions

bitter

Ancestry of “marcus”, step by step

Step	Language	Word	Meaning
1	Vulgar Latin	(a)maricosus	—
2	Latin	amārus	—
3	Proto-Indo-European	h₂eh₃mós	raw; uncooked; bitter
4	Proto-Indo-European	h₂eh₃-	to be hot; to burn

Every word from Proto-Indo-European h₂eh₃- →

marcus — Etymology, Origin & Word History | Etymology Explorer