Where does “甲信越” come from?

甲信越 (Japanese) comes from Japanese 甲斐 — value, reward, avail, being fruitful or worth...

Ancestry of “甲信越”, step by step

甲信越 traces back through two separate lines of ancestry.

via Japanese 甲斐

StepLanguageWordMeaning
1Japanese甲斐value, reward, avail, being fruitful or worth...

via Japanese 越後

StepLanguageWordMeaning
1Japanese越後
Every word from Japanese 甲斐