Cognomen Niccolai (Niccolai 
, نيكولاي 
, Никколай 
) , throughout the world, is quite a rare family name. The family name Niccolai is habitual in Italy, where it is quite a rare surname, Argentina, where it is a rare surname, and Switzerland. Measured by absolute frequency, it is the most numerous in Italy, the United States, and France. Much less frequently, Niccolai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Niccolai | Italy, United States, Argentina, France, Brazil |
| نيكولاي | Yemen, Palestinian Territory, Iraq |
| Никколай | Russia |
| marc'antonio niccolai (1581-1647) (b. 1581) |
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| alfonso niccolai Italian theologian, IT (b. 1706) |
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beppe niccolai Italian politician (1920-1989), IT (b. 1920) |
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cesarino niccolai IT (b. 1918) |
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| adelmo niccolai Italian politician (1885-1948), IT (b. 1885) |
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| francesco niccolai IT (b. 1881) |
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michele niccolai Italian sculptor, IT (b. 1953) |
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| lorenzo niccolai Italian association football player (1904-1978), IT (b. 1904) |
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| eugenio niccolai IT (b. 1895) |
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| juan niccolai IT (b. 1898) |
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| raffaello niccolai Italian association football player, IT (b. 1910) |
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| armand niccolai American football player (1911-1988), US (b. 1911) |
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| giulia niccolai Italian writer, IT (b. 1934) |
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| comunardo niccolai Italian footballer, IT (b. 1946) |
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| gerald niccolai chemist (b. 1965) |
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