Where does “間欠泉” come from?

間欠泉 (Japanese) comes from Japanese 泉, from Japanese 和泉.

間欠泉 (Japanese): a geyser

Definitions

Step	Language	Word	Meaning
1	Japanese	泉	natural spring, a wellspring
2	Japanese	和泉	—

間欠泉 — Etymology, Origin & Word History | Etymology Explorer