Where does “Roem” come from?

Roem (Old French) comes from Latin Rotomagus, from Gaulish Ratumacos, from Gaulish magos, from Proto-Celtic magos, from Proto-Indo-European meǵh₂- — big, great; great; big, stour, great.

Ancestry of “Roem”, step by step

Step	Language	Word	Meaning
1	Latin	Rotomagus	—
2	Gaulish	Ratumacos	—
3	Gaulish	magos	field
4	Proto-Celtic	magos	plain, field
5	Proto-Indo-European	meǵh₂-	big, great; great; big, stour, great

Every word from Proto-Indo-European meǵh₂- →

Roem — Etymology, Origin & Word History | Etymology Explorer