Family name Budaj (Budaj 
, Будай 
) , throughout the world, is quite a rare last name. The family name Budaj is characteristic of Slovakia, where it is quite a rare surname, Belarus, and Croatia. In absolute terms, it is the most numerous in Eastern Europe, particularly Ukraine, Belarus, and Slovakia. Very seldom, Budaj is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Budaj | Slovakia, Czechia, Poland, United States, Croatia |
| Будай | Kazakhstan, Russia, Ukraine, Belarus |
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ján budaj Slovak member of Slovak National Council, head of Slovak National Council and politician, SK (b. 1952) |
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peter budaj Slovak ice hockey player, SK (b. 1982) |
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| ondrej budaj (b. 1925) |
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| andrzej budaj Polish internist and cardiologist, PL (b. 1953) |
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| pavol budaj (b. 1955) |
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