Where does “ינואר” come from?

ינואר (Hebrew) comes from German Januar, from Latin iānuārius, from Latin -ārius, from Proto-Italic *-āzios.

Ancestry of “ינואר”, step by step

Step	Language	Word	Meaning
1	German	Januar	January
2	Latin	iānuārius	—
3	Latin	-ārius	—
4	Proto-Italic	*-āzios	—