Where does “January” come from?

January derives from Latin ianuarius, named after Janus, ultimately from Proto-Indo-European h₁ey- meaning to go or proceed.

Ancestry of “January”, step by step

Step	Language	Word	Meaning
1	Middle English	Ieneuer	—
2	Anglo-Norman	genever	—
3	Latin	iānuārius	—
4	Latin	-ārius	—
5	Proto-Italic	*-āzios	—

Words derived from “January”

Every word from Proto-Italic *-āzios →

January — Etymology, Origin & Word History | Etymology Explorer