Etymology and distribution of 十六澤.

Izasawa 【十六澤】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Ibaraki-ken , Okayama-ken .

① Ibaraki-ken Shimotsuma-shi Tell the praises in big trees. Chiba-ken Katori-shi Isoyama was a place name with a record since the Edo period.

② In Okayama-ken Kume-gun Misaki-chou tells it to be from Isoyama castle of Yamanashi-ken . Period, location unknown. Okayama-ken Maniwa-shi Katsuyama was in the Edo period in the Misaki Katsuyama clan in the Clan office.

③ Fukuoka-ken Fukuoka-shi Chuo-ku Castle interior was in the Edo era in the Fukuoka samurai of the clan office. The same samurai is said to have been Isomura surname by Hyougo - ken southwestern part (formerly known as Harima Country). 磯村 Isomura reference.