Where does “Ἰανουάριος” come from?

Ἰανουάριος (Koine Greek) comes from Latin iānuārius, from Latin -ārius, from Proto-Italic *-āzios — Forms relational adjectives to nouns (and rarely numerals).

Ancestry of “Ἰανουάριος”, step by step

StepLanguageWordMeaning
1Latiniānuāriusof January
2Latin-āriuser
3Proto-Italic*-āziosForms relational adjectives to nouns (and rarely numerals)

Words derived from “Ἰανουάριος”

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