Sakana

Sakana (サカナ) is the common modern term for fish. Interestingly, though, this originally meant something different: food to go with sake (rice wine). In fact, the "saka" in "sakana" is from "sake." The "na" means "a side dish," to the current word for fish actually means "a side dish to go with sake." This presumably happened because grilled fish was a popular accompaniment to sake. Incidentally, the older term for fish, which is still used at times today, is "uo," or in an older spelling, "uwo."