Cognomen Křiváček (Křiváček 
) , worldwide, is a very rare family name. The last name Křiváček is habitual in Eastern Europe, particularly Czechia, where it is a rare surname.
| VARIANT | COUNTRY |
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| Křiváček | Czechia |
Krivacek, and Křiváčková
| oskar křiváček holocaust victim, b. 1889-01-20 (b. 1889) |
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| otto křiváček holocaust victim, b. 1899-10-31, CZ (b. 1899) |
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| františek křiváček CZ (b. 1905) |
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| karel křiváček (b. 1909) |
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| ladislav křiváček CZ (b. 1940) |
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| petr křiváček CZ (b. 1943) |
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| miroslav křiváček CZ (b. 1952) |
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| matouš křiváček CZ (b. 1972) |
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