Where does “Ionawr” come from?

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

Ancestry of “Ionawr”, step by step

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

Ionawr — Etymology, Origin & Word History | Etymology Explorer