Shimakawa 【島川】5 The Japanese surnames etymology dictionary.
Yamaguchi-ken , Kumamoto-ken , Saitama-ken . There is a surname including "Seki". "Ei" is a favorable character. Hyougo-ken Ono-shi Nishimoto-cho was in the Edo period in the Ono Clan in the Clan Office. In the Edo era to the same clan was also the notation of "Seki". It is unknown whether the president exists. Saitama-ken Minamisaitama-gun Miyashiro-machi It was in Edo era in Kanbara.