Where does “-in” come from?

-in (Dutch) comes from Middle Dutch -inne, from Old Dutch -inna, from Proto-Germanic -inī, from Proto-Indo-European -én-ih₂ ~ -n̥-yéh₂-.

-in (Dutch): Forms nouns for the female counterpart of...

Definitions

Step	Language	Word	Meaning
1	Middle Dutch	-inne	—
2	Old Dutch	-inna	—
3	Proto-Germanic	-inī	Forms nouns indicating a female individual
4	Proto-Indo-European	-én-ih₂ ~ -n̥-yéh₂-	—

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