Where does “janeiro” come from?

janeiro (Portuguese) comes from Old Portuguese janeiro, from Old Portuguese janeyro, from Latin iānuārius, from Latin -ārius, from Proto-Italic *-āzios — Forms relational adjectives to nouns (and rarely numerals).

janeiro (Portuguese): January

Definitions

January

Ancestry of “janeiro”, step by step

Step	Language	Word	Meaning
1	Old Portuguese	janeiro	Alternative form of janeyro
2	Old Portuguese	janeyro	January
3	Latin	iānuārius	of January
4	Latin	-ārius	er
5	Proto-Italic	*-āzios	Forms relational adjectives to nouns (and rarely numerals)

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