Cognomen Lacek (Lacek 
) , globally, is a rare last name. The cognomen Lacek is habitual in Eastern Europe, particularly Slovakia, where it is quite a rare surname, Czechia, where it is a rare surname, and Poland. Measured by absolute frequency, the name is most common in the United States, Poland, and Slovakia. Likewise, Lacek is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Lacek | Austria, Slovakia, Czechia, Poland, United States |
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lacek z kravař Roman Catholic bishop, CZ (b. 1370) |
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| mikuláš lacek Czech science writer (1927-2008), SK (b. 1927) |
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lacek z kravař a helfštejna |
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| miroslav lacek CZ (b. 1959) |
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| jozef lacek researcher |
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| andrew t lacek researcher |
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| krzysztof lacek PL |
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