Cognomen โอนิชิ (Ohnishi 
, โอนิชิ 
) , globally, is a rare surname. The family name โอนิชิ is habitual in Japan, where it is a rare surname, Singapore, where it is a very rare surname, and Brazil. In absolute terms, it is the most numerous in Japan, Brazil, and the United States. Also, โอนิชิ is the forename as well as the last name.