Etymology and distribution of 井定.

Isada 【井定】^{レベル2
About 20}  The Japanese surnames etymology dictionary.

Shiga-ken Higashioumi-shi , Oosaka-fu , Toukyou-to .

① Mie-ken Iga-shi birth from Inaide. A place name with a record since the Heian period. The place name was also written as "Ida". Ehime-ken Imabari-shi Totomachi was in the Edo period in the Imabari clan of the Clan Office.

② Abstract . Iida's abbreviation. Fukuoka-ken Kurume-shi Sasayama-machi was in the Edo period in the Kurume clan in the Clan office. Tell the same clan that Iida was last name in the early Edo period. 飯田 Iida reference.