It is an African (Luo) surname. The origin of the name is based on the Luo verb that means “to be bent” or “to be twisted.” It is not an uncommon Luo surname. The name comes from Swahili and refers to members of the Luo tribe who converted to Islam.
Obama (小浜) is also a Japanese surname literally meaning "little beach". The Obama clan (小浜氏) were a samurai clan of feudal Japan.