Family name Кавальчук (Кавальчук 
, Kavalchuk 
, Kavaltchouk) , in the entire world, is a rare surname. The cognomen Кавальчук is characteristic of Belarus, where it is quite a rare surname, Czechia, where it is a rare surname, and Kyrgyzstan. In absolute terms, this name is the most popular in Eastern Europe, particularly Belarus, Poland, and Russia. Much less frequently, Кавальчук is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Кавальчук | Ukraine, Kazakhstan, Belarus, Russia, Kyrgyzstan |
| Kavalchuk | Canada, Belarus, Czechia, Poland, United States |
| Kaval'Chuk | Belarus |
Kovalchuk, Kovaltchouk, Kowalchyk, Kowaltschuk, and Ковальчук
| захар захаравіч кавальчук politician, BY (b. 1893) |
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| мікалай пракопавіч кавальчук BY (b. 1886) |
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| віктар іванавіч кавальчук BY (b. 1954) |
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| сяргей міхайлавіч кавальчук Belarussian politician, BY (b. 1968) |
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| яўген кавальчук BY (b. 1990) |
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