Family name Karatzas (Karatzas 
) , in all the world, is quite a rare surname. The surname Karatzas is habitual in Greece, where it is quite a common surname, Cyprus, where it is quite a rare surname, and Belgium, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in Greece, the United States, and Germany. Much less frequently, Karatzas is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Karatzas | Belgium, Greece, Cyprus, United States, Germany |
| dionisis karatzas Greek writer, GR (b. 1950) |
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| ioannis karatzas (b. 1952) |
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| dimosthenis karatzas researcher |
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| kimon andreas g karatzas researcher |
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| anastasios karatzas researcher (ORCID 0000-0002-8631-9340) |
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| ioannis a. karatzas botanist |
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| george karatzas 1765 |
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| ioannis karatzas Ph.D. Columbia University 1980 |
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| kostas karatzas researcher |
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| christos karatzas badminton player, GR (b. 1989) |
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Mr, Joan, Tina, Nick, Niko, Ella, Evan, Ioan, Maria, Sarah, Sakis, Simos, Sofia, Steve, Spyro, Athan, Athas, April, Avril, Chris, Cindy, Basil, John, Betty, Jane, Lena, Ms, Lu, Rob, Jim, Tom, Tim, Eli, Mary, Alex, Andy, Anna, Anne, Aris, Cate, Bill, Kiki, Paul, Pete, Dina, Dino, Dora, Lily, and Becky