Where does “-zar” come from?

-zar (Basque) comes from Basque zahar, from Proto-Basque *za(h)ar.

Ancestry of “-zar”, step by step

Step	Language	Word	Meaning
1	Basque	zahar	old, aged
2	Proto-Basque	*za(h)ar	—

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