Etymology and distribution of 眞勢.

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

Yamagata-ken Yonezawa-shi , Saitama-ken , Niigata-ken . Heterogeneity of 安孫子 . 安孫子 Abiko reference. Yamagata-ken Yonezawa-shi Marunouchi was in the Edo period in the clan of the Yonezawa clan in the clan office.