Last name Kovalchuk (Ковальчук 
, Kovalchuk 
, Ковалчук ) , all over the world, is a widespread surname. The cognomen Kovalchuk is characteristic of Ukraine, where it is a common surname, Belarus, and British Virgin Islands, where it is quite a common surname (explore the name in all countries). Measured by absolute frequency, it most frequently occurs in Eastern Europe, particularly Ukraine, Russia, and Belarus.
| VARIANT | COUNTRY |
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| Ковальчук | Ukraine, Belarus, Russia, Kyrgyzstan, Kazakhstan |
| Kovalchuk | Ukraine, Belarus, Poland, Russia, United States |
| Ковалчук | Ukraine, Russia |
| fedor kovalchuk Ukrainian Righteous Among the Nations, UA (b. 1906) |
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| maria kovalchuk Ukrainian Righteous Among the Nations, UA (b. 1912) |
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| leonid kovalchuk Ukrainian Righteous Among the Nations, UA (b. 1922) |
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olga kovalchuk Ukrainian Paralympic sport shooter (b. 1976) |
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| anastasia kovalchuk Ukrainian Righteous Among the Nations, UA (b. 1927) |
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| sofia kovalchuk Belarusian Righteous Among the Nations, BY (b. 1932) |
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| volodymyr kovalchuk PL (b. 1941) |
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| vladimir aleksanderovich kovalchuk RU (b. 1951) |
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| oleg kovalchuk (b. 1956) |
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| vasylyna kovalchuk researcher (ORCID 0000-0002-7199-524X) |
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| sergey kovalchuk researcher ORCID 0000-0001-8828-4615 |
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| andrei nikolaevich kovalchuk Ph.D. Belorussian State University 2004 |
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| d g kovalchuk researcher |
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| maria kovalchuk researcher |
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| volodymyr i. kovalchuk researcher |
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