Family name Ratnik (Ratnik 
) , around the world, is a rare surname. The surname Ratnik is habitual in Estonia, where it is quite a common surname, Slovenia, where it is quite a rare surname, and Lithuania, where it is a rare surname. Measured by absolute frequency, it is commonest in Estonia, Slovenia, and Australia.
| VARIANT | COUNTRY |
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| Ratnik | United Kingdom, Slovenia, Estonia, Australia, France |
| eha ratnik Estonian art historian, EE (b. 1928) |
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| endel ratnik Estonian engineer, EE (b. 1929) |
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| velda ratnik Estonian engineer, EE (b. 1934) |
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| juhan ratnik Estonian zootechnician, EE (b. 1941) |
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| diane ratnik Canadian volleyball player, CA (b. 1962) |
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| mariin ratnik Estonian diplomat, EE (b. 1976) |
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| alfred ratnik Estonian footballer, EE |
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| ratnik gandhi Ph.D. Dhirubhai Ambani Institute of Information and Communication Technology 2011 |
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| saša marija ratnik SI |
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Mr, Rowan, Leila, Janja, Tamar, Taavi, Tiina, Tyler, Elena, Henri, Velda, Marcel, Monika, Melani, Sharon, Sheila, Silver, Alenka, Ankica, Kaspar, Rainer, Daniil, Roman, Peter, Petra, Keven, Ms, Ron, Tom, Eli, Ian, Alex, Carl, Paul, Raul, Dean, Damien, Gary, John, Olga, Marko, Matea, Milan, Saša, Susan, Karin, Karla, Konan, Lisa, and Dorian