Where does “par-” come from?

par- (English) comes from Ancient Greek πᾰρᾰ-, from Ancient Greek παρά, from Latin verēdus, from Gaulish werēdos, from Proto-Celtic *uɸoreidos.

Ancestry of “par-”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	πᾰρᾰ-	near; next to; by, near
2	Ancient Greek	παρά
3	Latin	verēdus	—
4	Gaulish	werēdos	horse
5	Proto-Celtic	*uɸoreidos	—

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