Surname Ковальчук (Ковальчук 
, Kovalchuk 
, Kovaltchouk 
) , in the entire world, is a widespread last name. The surname Ковальчук is habitual in 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 | Belarus, Ukraine, Poland, Russia, United States |
| Kovaltchouk | Canada, Argentina, France, Germany, United States |
| Koval'Chuk | Belarus, Bulgaria |
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міхал ковальчук Polish architect, UA (b. 1855) |
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| ковальчук, евдокия борисовна politician, RU (b. 1881) |
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| ковальчук лев полікарпович UA (b. 1875) |
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ковальчук станіслав мар'янович Ukrainian painter, UA (b. 1942) |
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михаил валентинович ковальчук Russian physicist and politician, RU (b. 1946) |
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ковальчук, александр сергеевич UA (b. 1938) |
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| ковальчук, николай кузьмич Soviet politician, UA (b. 1902) |
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виктория владимировна ковальчук Ukrainian artist, writer (1954–2021), UA (b. 1954) |
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ковальчук, леонид акимович UA (b. 1947) |
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ковальчук, андрей николаевич Russian sculptor and People's artist of Russia, RU (b. 1959) |
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| ковальчук, всеволод львович Soviet camera operator (1909-1976), UA (b. 1909) |
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| ковальчук, александр петрович Soviet camera operator (1910-1967), UA (b. 1910) |
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ковальчук галина іванівна UA (b. 1953) |
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ковальчук костянтин федорович UA (b. 1955) |
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дарья богдановна ковальчук UA (b. 1957) |
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