Where does “-trom” come from?

-trom (Proto-Italic) comes from Proto-Indo-European -trom, from Proto-Indo-European -tḗr — Derives agent nouns from verbs, denoting someone...

Ancestry of “-trom”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	-trom	Forms nouns denoting a tool or instrument
2	Proto-Indo-European	-tḗr	Derives agent nouns from verbs, denoting someone...

-trom — Etymology, Origin & Word History | Etymology Explorer