Last name Jasaitis (Jasaitis 
, Ясайтис 
) , around the globe, is a rare family name. The cognomen Jasaitis is habitual in Lithuania, where it is quite a common surname, Latvia, where it is quite a rare surname, and Hungary, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Lithuania, the United States, and Latvia. Much less frequently, Jasaitis is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Jasaitis | Hungary, Latvia, United States, Lithuania, Spain |
| Ясайтис | Ukraine, Russia |
| domas jasaitis (b. 1898) |
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| viktoras jasaitis LT (b. 1901) |
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| juozas jasaitis Lithuanian writer, LT (b. 1930) |
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darius jasaitis LT (b. 1973) |
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| sigitas jasaitis badminton player, LT (b. 1949) |
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| julius jasaitis Lithuanian judge, LT (b. 1955) |
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| gintaras jasaitis (b. 1964) |
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| matt jasaitis college basketball player (2018–2018) Santa Clara |
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| valdas jasaitis Ph.D. Vilniaus universitetas 2012 |
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| karolis jasaitis Lithuanian footballer, LT (b. 1982) |
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| edvinas jasaitis Lithuanian association football player, LT (b. 1990) |
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Mr, Paulo, Paige, Peter, Roger, Rokas, Linas, Lukas, James, Jonas, Brain, Jorge, Tadas, Tomas, Nedas, Elena, Marius, Marcos, Mantas, Sandra, Simone, Julia, Casey, Aidas, Arnas, Al, Amy, Kim, Jan, Tim, Ina, Mary, Mark, Matt, Adam, Kate, John, Judy, Troy, Nick, Niki, Vida, Veto, Zeno, Sandy, Simas, Stasys, and Andrea