Family name Gruca (Gruca 
) , in the entire world, is quite a rare surname. The surname Gruca is characteristic of Andorra, where it is quite a rare surname, Poland, and Slovakia, where it is a rare surname. Not in comparison with a country's population, it is commonest in Poland, the United States, and Germany. Also, Gruca is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gruca | Germany, France, Poland, United Kingdom, United States |
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adam gruca Polish orthopaedist, inventor, and surgeon (1893-1983), PL (b. 1893) |
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witold gruca PL (b. 1927) |
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| maria gruca Polish Righteous Among the Nations, PL (b. 1910) |
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| marian gruca PL (b. 1915) |
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| wiktor gruca (b. 1934) |
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| isabelle gruca author of French textbooks, FR (b. 1952) |
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| piotr gruca researcher ORCID ID = 0000-0001-5709-0359, PL (b. 1963) |
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| anna gruca (b. 1953) |
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| remigiusz józef gruca (b. 1959) |
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| dorota gruca Polish long distance runner, PL (b. 1970) |
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| thomas s gruca researcher |
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| marta gruca researcher |
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| martin m gruca researcher (ORCID 0000-0002-2705-4821) |
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| margaret gruca researcher |
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| jacek a. gruca researcher |
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