Cognomen سايتو (Saito 
, Sayto 
, سايتو) , around the world, is a common last name. The family name سايتو is habitual in Japan, where it is quite a rare surname, Brazil, and Singapore. In absolute terms, it is commonest in Brazil, Japan, and the United States. Very seldom, سايتو is the forename as well as the last name.