Where does “onrein” come from?

onrein (Dutch) comes from Middle Dutch onreine, from Old Dutch unreini, from Proto-West Germanic *unhrainī, from Proto-Germanic *unhrainiz.

onrein (Dutch): unclean

Definitions

Step	Language	Word	Meaning
1	Middle Dutch	onreine	—
2	Old Dutch	unreini	unclean
3	Proto-West Germanic	*unhrainī	—
4	Proto-Germanic	*unhrainiz	—

onrein — Etymology, Origin & Word History | Etymology Explorer