Cognomen Nicolaou (Nicolaou 
, 尼古 
, Николау 
) , globally, is quite a common family name. The last name Nicolaou is habitual in Cyprus, where it is a widespread surname, Australia, where it is quite a rare surname, and Greece. Measured by absolute frequency, it is commonest in Cyprus, the United Kingdom, and Australia. Much less frequently, Nicolaou is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Nicolaou | Australia, France, United Kingdom, United States, Cyprus |
| 尼古 | China |
| Николау | Kazakhstan, Russia, Ukraine |
| Νικολάου | Greece |
| kyriakos nicolaou Cypriot archaeologist (b. 1918) |
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| jacques nicolaou French comics artist, FR (b. 1930) |
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panicos nicolaou |
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| george nicolaou Cypriot judge, CY (b. 1945) |
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| thomas nicolaou GR (b. 1937) |
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| danièle nicolaou French politician, FR (b. 1948) |
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| ted nicolaou American film editor, film director and screenwriter, US (b. 1949) |
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| carola nicolaou (b. 1949) |
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| anna nicolaou researcher |
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| paschalis nicolaou researcher |
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| anna nicolaou Ph.D. Yale University 1990 |
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| constantinos nicolaou researcher |
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| charalambos nicolaou researcher in particle physics |
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| nicolaos c. nicolaou researcher |
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| christos a nicolaou researcher |
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