Where does “桑” come from?

桑 (Chinese) comes from Japanese さん, from Japanese 様, from Middle Chinese 樣.

Ancestry of “桑”, step by step

Step	Language	Word	Meaning
1	Japanese	さん	A title used after person's name regardless of...
2	Japanese	様	way, style, appearance; be like, look like, seem...
3	Middle Chinese	樣	—

桑 — Etymology, Origin & Word History | Etymology Explorer