Where does “*jọnọr” come from?

*jọnọr (Proto-Brythonic) comes from Vulgar Latin *iānārius, from Latin iānuārius, from Latin -ārius, from Proto-Italic *-āzios.

Ancestry of “*jọnọr”, step by step

Step	Language	Word	Meaning
1	Vulgar Latin	*iānārius	—
2	Latin	iānuārius	—
3	Latin	-ārius	—
4	Proto-Italic	*-āzios	—

*jọnọr — Etymology, Origin & Word History | Etymology Explorer