Cognomen Kalaus (Kalaus 
) , in the entire world, is a rare last name. The last name Kalaus is habitual in Estonia, where it is quite a common surname, Hungary, where it is a rare surname, and Croatia. In absolute terms, the name is most common in Estonia, Hungary, and India. Very seldom, Kalaus is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kalaus | Hungary, Estonia, United States, India, Malaysia |
| simon kalaus composer and teacher (b. 1715) |
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| heiki kalaus Estonian trombonist, EE (b. 1950) |
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| maie kalaus Estonian violinist, EE (b. 1951) |
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| kalaus valter Hungarian swimmer, HU (b. 1970) |
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| hubert kalaus researcher |
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| paul kalaus |
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| larissa kalaus Croatian handball player, HR (b. 1996) |
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| dora kalaus Croatian handball player, HR (b. 1996) |
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Mr, Merike, Sergey, Ashley, Kalmer, Joseph, Junika, Jānis, Tracey, Tyrone, Marcin, Hubert, Michael, Stephen, Colleen, Pauline, Dorothy, Dragana, Larissa, Nichole, Herbert, Ferkle, Frank, Vince, Elisa, Ms, Dee, Mary, Mark, Keiu, Kurt, Dora, John, Nora, Neil, Ivar, Ione, Brent, Bryce, Delia, David, Lance, Linda, Lilie, Jason, Jenae, Anastasia, and Christian