Where does “ulnaire” come from?

ulnaire (French) comes from French -aire, from Latin -ārius, from Proto-Italic *-āzios.

ulnaire (French): ulnar

Definitions

Step	Language	Word	Meaning
1	French	-aire	-ary; -aire
2	Latin	-ārius	—
3	Proto-Italic	*-āzios	—

ulnaire — Etymology, Origin & Word History | Etymology Explorer