From Proto-Japonic *intomi (“spring”). *idomi spring Northern Ryukyuan: Kikai: 泉 (ijumi) Northern Amami Ōshima: 泉 (izumi, ijomi) Okinawan: 泉 (ijun) Okinoerabu:...
*intomi spring Old Japanese: 泉 (idumi) Japanese: 泉 (izumi) Proto-Ryukyuan: *idomi Northern Ryukyuan: Kikai: 泉 (ijumi) Northern Amami Ōshima: 泉 (izumi, ijomi)...