Koyamada clan (小山田氏, Koyamada-shi) is one of the Japanese samurai clans.
The Koyamada Clan was headquartered in the Satsuma Domain, which was one of the most powerful feudal domains in Tokugawa Japan, and played a major role in the Meiji Restoration and in the government of the Meiji period which followed.
The direct descendant is Shin Koyamada, who was born and raised in Japan and resides in the United States.
References
Koyamada clan Wikipedia(Text) CC BY-SA