Etymology and distribution of 悦淵.

Iwaibuchi 【悦淵】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Hyougo-ken , Nagano-ken , Oosaka-fu . Origin of Kyouto-fu Uji-shi . A place name with a record since the Nara period. The place name was also written as "菟 道". Wakayama-ken Uji of Wakayama-shi is a place name with a record since the Heian period. It was in the Edo period in the same place.