Surname Zelko (Zelko 
, Зелко 
, Zelkó ) , in all the world, is quite a rare family name. The last name Zelko is habitual in Slovenia, where it is quite a common surname, Slovakia, where it is quite a rare surname, and Hungary, where it is a rare surname. In absolute terms, the name is most common in the United States, Slovenia, and Slovakia. Much less frequently, Zelko is the forename as well as the last name.
| ivan zelko SI (b. 1912) |
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zelko vlahovic HR (b. 1973) |
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| ludvik zelko Slovene field hockey player (1944-), SI (b. 1944) |
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| zelko wiener Austrian writer and artist, AT (b. 1953) |
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| andrej zelko Slovenian footballer, SI (b. 1968) |
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| giovanni zelko American film producer, US (b. 1974) |
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| aurel zelko researcher |
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| ivan zelko researcher ORCID ID = 0000-0003-0260-3705 |
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| igor n zelko researcher |
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| justine zelko researcher (ORCID 0000-0002-6467-2012) |
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| frank zelko researcher |
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| jasmina zelko Slovene association football player, SI (b. 1987) |
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| erika zelko SI |
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| žan luka zelko Slovenian sailor (b. 1994) |
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