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Surname Oniski in modern Croatia
In Croatia, Oniski families are Croats (from Krizevci ).

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Prevalence
Only a few people with faimily name Oniski live in Croatia today, in one household only.
They are located in one Croatian city only, in Krizevci (<5).
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Outside Croatia
Family name Oniski is present in five countries on three continents. "Onyski " is used by some 50 people in the United States.
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Characteristic first names
Kata Oniski,
Ivančica Oniski,
Josip Oniski,
Katica Oniski,
Marija Oniski