Family name Kotsakis (Kotsakis 
) , in all the world, is quite a rare cognomen. The surname Kotsakis is habitual in Greece, where it is quite a rare surname, Bulgaria, where it is a rare surname, and Australia, where it is a very rare surname. Not in comparison with a country's population, this name is the most popular in Greece, the United States, and Australia.
| VARIANT | COUNTRY |
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| Kotsakis | Italy, Canada, Australia, United States, Greece |
| demetrios d. kotsakis Greek mathematician (b. 1909) |
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| georgios a kotsakis researcher |
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| andreas kotsakis doctoral candidate at the London School of Economics and Political Science |
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| athanasios kotsakis researcher |
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| christopher kotsakis researcher (ORCID 0000-0002-2866-5851) |
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Mr, Aliki, Chris, Corey, Kalen, Kelly, Kyler, Panos, Peter, Rigas, Diego, Georg, Linda, Louis, Janet, Joyce, Tasia, Tasos, Terry, Nikol, Alice, Stacy, Minas, Maria, May, Ana, Ann, Ted, Ele, Vaz, Alex, Anna, Apsw, Nikos, Dina, Dora, Greg, Gian, Jane, John, Nick, Niko, Hlia, Zois, Dimi, and Elise