Cognomen ไซโต (Saito 
, Saitou , Zyto 
) , in all the world, is a common last name. The surname ไซโต is habitual in Japan, where it is quite a rare surname, Brazil, and Singapore. Not in comparison with a country's population, it is commonest in Brazil, Japan, and the United States. Much less frequently, ไซโต is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Saitou, Saito | Japan, Brazil, China, United States, Indonesia |
| Zyto | Poland, France, Brazil, United States, Canada |
| ไซโต | Thailand |