Where does “*jọnọr” come from?

*jọnọr (Proto-Brythonic) comes from Vulgar Latin *iānārius, from Latin iānuārius, from Latin -ārius, from Proto-Italic *-āzios — Forms relational adjectives to nouns (and rarely numerals).

Ancestry of “*jọnọr”, step by step

Step	Language	Word	Meaning
1	Vulgar Latin	*iānārius	—
2	Latin	iānuārius	of January
3	Latin	-ārius	er
4	Proto-Italic	*-āzios	Forms relational adjectives to nouns (and rarely numerals)

Words derived from “*jọnọr”

Ionawr

Every word from Proto-Italic *-āzios →Every word from Latin -ārius →Every word from Latin iānuārius →