Cognomen Vaičiūnas (Vaičiūnas 
, Вайчюнас 
) , across the world, is a rare surname. The last name Vaičiūnas is characteristic of Lithuania, where it is quite a rare surname, Belarus, where it is a very rare surname, and Russia, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Vaičiūnas | Lithuania |
| Вайчюнас | Russia, Ukraine, Belarus |
| antanas vaičiūnas Lithuanian singer, LT (b. 1890) |
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| viktoras vaičiūnas Lithuanian psychiatrist, LT (b. 1896) |
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žygimantas vaičiūnas Lithuanian politician, LT (b. 1982) |
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| albinas vaičiūnas Lithuanian historian, LT (b. 1933) |
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| vytautas steponas vaičiūnas Lithuanian university teacher and catholic priest, LT (b. 1944) |
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| virgilijus vaičiūnas Lithuanian architect, LT (b. 1954) |
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| rolandas vaičiūnas Lithuanian basketball player (1975-), LT (b. 1975) |
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| tadas vaičiūnas Lithuanian basketball player, LT (b. 1999) |
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Matas, Dovydas, Edvinas, Einoras, Egidijus, Martynas, Robertas, Rimantas, Deividas, Donaldas, Džiugas, Laurynas, Laimonas, Eduardas, Mindaugas, Gediminas, Algimantas, Augustinas, Donatas, Dainius, Karolis, Aivaras, Simas, Rokas, Domas, Lukas, Tadas, Tomas, Ignas, Marius, Povilaitis, Mantas, Justas, Jurgis, Juozas, Vilius, Albinas, Alvydas, Artūras, Airenas, Darius, and Valdemaras