Family name オーツカ (Otsuka 
, オーツカ) , all around the world, is quite a rare cognomen. The surname オーツカ is habitual in U.S. Virgin Islands, where it is quite a common surname, Singapore, where it is quite a rare surname, and Hong Kong. Not in comparison with a country's population, it most frequently occurs in Brazil, Japan, and the United States. Much less frequently, オーツカ is the forename as well as the last name.