Where does “六出” come from?

六出 (Japanese) comes from Japanese 出, from Japanese 出る, from Old Japanese 出づ, from Proto-Japonic *intu.

Ancestry of “六出”, step by step

六出 traces back through two separate lines of ancestry.

Step	Language	Word	Meaning
1	Japanese	出	the process of something coming out; something...
2	Japanese	出る	to leave a place; to go out; to come forth, to be...
3	Old Japanese	出づ	to come out, go out; to leave, depart; to show up
4	Proto-Japonic	*intu	—

Step	Language	Word	Meaning
1	Japanese	六	six; a name of a hole of a wind instrument
2	Late Middle Chinese	六	—