Where does “いつ” come from?

いつ (Japanese) comes from Old Japanese いつ, from Proto-Japonic etu — five.

いつ (Japanese): when

Definitions

  1. when

Ancestry of “いつ”, step by step

いつ traces back through two separate lines of ancestry.

via Old Japanese いつ

StepLanguageWordMeaning
1Old Japaneseいつ—
2Proto-Japonicetufive

via Japanese いつか

StepLanguageWordMeaning
1Japaneseいつかsometime, at some point

Words derived from “いつ”

Every word from Proto-Japonic etu →Every word from Old Japanese いつ →