Cognomen Ocko (Ocko 
, Očko , Окко 
) , around the globe, is quite a rare family name. The surname Ocko is characteristic of Slovenia, where it is quite a common surname, Croatia, where it is quite a rare surname, and Slovakia. Measured by absolute frequency, it is commonest in the Democratic Republic of the Congo, Slovenia, and Slovakia. Very seldom, Ocko is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ocko | Czechia, Croatia, Slovenia, Slovakia, Democratic Republic of the Congo |
| Očko | Czechia, Croatia, Slovenia, Slovakia |
| Окко | Russia |
| ocko scharlensis Dutch historian, NL (b. 950) |
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| ocko i. tom brok East Frisian chieftains, DE (b. 1345) |
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| ocko ii. tom brok East Frisian chieftain, DE (b. 1407) |
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| bernard ocko American violinist, US (b. 1902) |
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| ida blank ocko American artist, US (b. 1912) |
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| jonathan k. ocko 1946- (b. 1946) |
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| samuel alan ocko Ph.D. Massachusetts Institute of Technology 2015 |
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| ilissa b ocko researcher (ORCID 0000-0001-8617-2249) |
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| peter ocko American television writer and producer, US |
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| samuel a ocko researcher (ORCID 0000-0003-3426-4517) |
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| ben ocko researcher |
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Mr, Yvon, Maria, Marta, Marko, Milan, Milma, Mirta, Mitja, Aline, Hope, Cully, Klara, Peter, Pedro, Pride, Damir, Leida, Loice, Loïc, Janis, Bruce, Evan, Joao, Josh, Ms, Sam, Ana, Bez, Rob, Dan, Jan, Ivo, Mary, Matt, Miro, Mike, Sion, Alex, Beth, Petr, Rita, Lena, Luiz, Luka, Jose, James, and Jasna