Surname Сумитани (Sumitani 
, Сумитани) , all around the world, is a rare last name. The cognomen Сумитани is habitual in Belgium, where it is a very rare surname, Brazil, and Netherlands. In absolute terms, it is the most numerous in Brazil, the United States, and Germany. Very seldom, Сумитани is the forename as well as the last name.