Surname Kostoulas (Kostoulas 
) , in the world, is quite a rare cognomen. The cognomen Kostoulas is characteristic of Greece, where it is quite a common surname, Switzerland, where it is a very rare surname, and Spain. Not in comparison with a country's population, the name is most common in Greece, the United States, and Germany. Very seldom, Kostoulas is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kostoulas | Spain, Switzerland, Greece, United States, Germany |
| ioannis d kostoulas researcher |
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| charilaos kostoulas researcher |
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| polychronis kostoulas researcher |
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| theodoros kostoulas researcher |
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| marios kostoulas Greek footballer, GR (b. 1996) |
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Mr, Petros, George, Loukas, Jannis, Jordan, Thanos, Thomas, Fotios, Sotiris, Stavros, Andreas, Christy, Giannis, Giorgos, Lambros, Lampros, Nikolas, Vasilis, Ioannis, Yiorgos, Xristos, Kosmas, Sotirios, Kostas, Angelo, Alex, Andy, John, Tony, Maria, Susan, Stacy, Chris, Panos, Demos, Georg, Tammy, Takis, Nikos, Fotis, Ilias, Marios, Sophia, Spiros, Andrea, Angela, Katina, and Sokratis