Etymology and distribution of 薬.

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

Hokkaidou , Ishikawa-ken .

Originated in the Hokuriku region (formerly Koshiga). In the Asuka period there is a place name recorded with the notation "Takashi". "Yue" used.

② Fukuoka-ken Chikujou-gun Chikujou-machi Originated from Otsuki (Etsuzaki), a small figure of Kanada. Ekuzaki at Fukuoka-ken .

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

薬クスリ参照。