Where does “和牛” come from?

和牛 (Japanese) comes from Japanese 和, from Middle Chinese 和.

和牛 (Japanese): wagyu; the meat of such cattle

Definitions

Step	Language	Word	Meaning
1	Japanese	和	peace, harmony, tranquillity, serenity; sum
2	Middle Chinese	和	—

和牛 — Etymology, Origin & Word History | Etymology Explorer