Etymology and distribution of 世貝.

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

Shizuoka-ken , Yamaguchi-ken , Toukyou-to . Distribution including hikiti.

① There is a surname including "Monday". In Shizuoka-ken hit. Estimated from Hitachi (Hitachi). Shizuoka-ken Izu-shi , Niigata-ken Murakami-shi Honmachi was in the Edo period in the clan's Murakami of the Clan Office.

② Korean type . There is a record of naturalization on Osaka-fu Higashioosaka-shi on January 20, 1969. The real name is Zhang. 張 Chou reference.