Etymology and distribution of 藺草.

Igusa 【藺草】^{レベル3
About 110}  The Japanese surnames etymology dictionary.

Nagano-ken , Aichi-ken , Hyougo-ken . A variant of 石禾 . In Yamanashi-ken , the Heian era, Nagano-ken Ueda-shi Koshido, Nagano-ken Kamiina-gun Minowa-machi It was in the Edo era in Naka -eki Oyade. 石禾 Isawa reference.