Cognomen Blak (Blak 
, بلاك 
, Blaka 
) , in the world, is a common family name. The cognomen Blak is habitual in Barbados, where it is quite a common surname, Denmark, where it is quite a rare surname, and Libya. Measured by absolute frequency, it most frequently occurs in Egypt, Algeria, and the United Kingdom. Likewise, Blak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Blak | Egypt, Poland, United States, United Kingdom, Algeria |
| بلاك | Saudi Arabia, Iraq, Egypt, Sudan, Libya |
| Blaka | Brazil, India, France, Albania, United States |
| Blackett | Canada, Barbados, Australia, United States, United Kingdom |
| edouard blak TR (b. 1824) |
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poul blak Danish journalist (1944-2017) (b. 1944) |
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kristian blak Faroese composer, DK (b. 1947) |
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| józef blak PL (b. 1905) |
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blak prophetz British musician, GB (b. 1967) |
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mikael blak (b. 1979) |
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| freddy blak Danish politician, DK (b. 1945) |
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| zbigniew blak correspondence chess player (b. 1954) |
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| pia blak (b. 1960) |
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| blak douglas Australian artist, AU (b. 1970) |
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| blak twang British rapper, GB (b. 1972) |
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| cristine blak accused of witchcraft, GB |
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| margaret blak accused of witchcraft, GB |
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| blak d. blackburn Quebecois political candidate, CA |
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| kathrin blak accused of witchcraft, GB |
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