Last name Kak (Kak 
, Coc , كاك 
) , worldwide, is a common cognomen. The cognomen Kak is characteristic of Guatemala, where it is quite a common surname, Belize, and Lebanon, where it is quite a rare surname. In absolute terms, it is commonest in Guatemala, India, and Indonesia. Also, Kak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Coc, Kak | Indonesia, Morocco, Guatemala, India, Myanmar |
| كاك | Sudan, Morocco, Egypt, Algeria, Iraq |
| กาก | Thailand |
| mieczysław kak PL (b. 1928) |
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| shakti kak (b. 1950) |
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| neeraj kak (b. 1954) |
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| ata kak GH (b. 1960) |
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| kapil kak Indian Air Force air marshal |
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| amba kak Indian researcher, IN |
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| manju kak Indian writer |
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| a. majeed kak botanist |
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| khemendra kak |
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| kartikeya kak Indian cricketer (b. 1996) |
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