Surname Zajančkauskas (Заянчкаускас 
, Zajančkauskas 
) , in all the world, is a very rare family name. The cognomen Zajančkauskas is characteristic of Lithuania, where it is a rare surname, Kazakhstan, where it is a very rare surname, and Russia, where it is an extremely rare surname. Much less frequently, Zajančkauskas is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Заянчкаускас | Kazakhstan, Russia |
| Zajančkauskas | Lithuania |
| stasys zajančkauskas Lithuanian poet, LT (b. 1911) |
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| kajetonas zajančkauskas LT (b. 1904) |
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