Maruuchi 【丸内】4 The Japanese surnames etymology dictionary.
Hokkaidou , Toyama-ken , Yamaguchi-ken . There is 吉川 surname. Toyama-ken Nakaniikawa-gun Tateyama-machi Senjaki , Yamaguchi-ken Iwakuni-shi Distributed in the costume town. In Yamaguchi-ken , Yamaguchi-ken Iwakuni-shi Yokoyama changed name in the Edo era by hiding Yoshikawa's "Yoshi" of the Iwakuni lord of the Clan office.