Where does “わし” come from?

わし (Japanese) comes from Japanese 私, from Old Japanese 私 — a personal or private matter.

Ancestry of “わし”, step by step

StepLanguageWordMeaning
1Japanesefirst-person singular pronoun: I, me; a personal...
2Old Japanesea personal or private matter

Words derived from “わし

Every word from Old Japanese Every word from Japanese