Family name Saito (サイトウ 
, Saito 
, Саито 
, along with others...) , worldwide, is a common surname. The surname Saito is habitual in Japan, where it is quite a rare surname, Brazil, and Singapore. Measured by absolute frequency, it is the most numerous in Brazil, Japan, and the United States. More frequently, Saito is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| サイトウ | Japan |
| Saito | China, Japan, Indonesia, Brazil, United States |
| Саито | Russia |
| ไซโต | Thailand |
| Сайто | Ukraine, Russia |
Nishijima, Nishishima, Nisijima, Sado, Sadoh, Safuji, Sahuji, Saido, Saidoh, Saitoh, Saitou, Saitó, Saitô, Saitō, Sato, Satoh, Satou, Sató, Satō, Saïto, Soto, Sotoh, Кадзуо, Манабу, Сато, Саіто, Сэидзи, Такаси, סאיטו, סטו, ساتو, สายต่อ, ใสโต, ไซโตะ, ไซโต้, ไซโท, さいとう, サイト, サトウ, and 赛多
| saito nobutoshi (b. 1554) |
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| saito nobuyoshi (b. 1559) |
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| ikkosai saito (b. 1804) |
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| yaheita saito Lieutenant General of Imperial Japanese Army, LIA (b. 1885) |
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kikuo saito American painter, US (b. 1939) |
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juniti saito Brazilian air force general, BR (b. 1942) |
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| masatoshi saito JP (b. 1885) |
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james saito American actor, US (b. 1955) |
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| minoru saito botanist (b. 1919) |
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| saito ei ichi Japanese painter, JP (b. 1920) |
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| nello saito Italian writer and teacher, IT (b. 1920) |
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| mitsuo saito Japanese economist (b. 1926) |
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yuki saito Japanese director, JP (b. 1979) |
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ayaka saito Japanese karateka |
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| yuzuru saito botanist (b. 1930) |
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