Surname Ivanauskas (Ivanauskas 
, Иванаускас 
) , in the entire world, is quite a rare cognomen. The family name Ivanauskas is habitual in Lithuania, where it is quite a common surname, Paraguay, where it is quite a rare surname, and Cyprus. Not in comparison with a country's population, it is commonest in Lithuania, Paraguay, and the United States.
| VARIANT | COUNTRY |
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| Ivanauskas | Paraguay, Canada, Lithuania, United Kingdom, United States |
| Иванаускас | Kazakhstan, Russia, Lithuania, Belarus |
| nikodemas ivanauskas LT (b. 1844) |
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| leonardas ivanauskas (b. 1845) |
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| bronius ivanauskas (b. 1896) |
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| vaclovas ivanauskas Lithuanian actor, LT (b. 1910) |
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| stasys ivanauskas Lithuanian photographer, LT (b. 1917) |
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| mikalojus ivanauskas (b. 1909) |
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| gintautas ivanauskas Lithuanian Righteous Among the Nations, LT (b. 1934) |
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| feliksas ivanauskas Belarusian mathematician, BY (b. 1945) |
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| antanas ivanauskas Lithuanian politician, LT (b. 1954) |
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| algirdas ivanauskas Lithuanian politician, LT (b. 1959) |
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| antanas ivanauskas LT (b. 1959) |
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| eugenijus ivanauskas (b. 1959) |
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| liudas ivanauskas researcher (ORCID 0000-0001-5390-2161) |
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| natália ivanauskas researcher |
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| gytis ivanauskas actor, dancer, choreographer, LT (b. 1980) |
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Mr, Marta, Sandy, Simas, Susan, Alana, Alfas, Algis, Arnas, Ainis, Aidas, Aaron, Carla, Carol, Casey, Benas, Rokas, Rimas, Rytis, Delia, Maria, Ieva, Egle, Emma, Kim, Kã, Ray, Joe, Ted, Mary, Mare, Mike, Alex, Danas, Aras, Paul, Ruth, Gail, Lisa, Jose, John, Joao, Tony, Elba, Kari, and Domas