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Cognomen Popaja (Popaja
) , worldwide, is a rare family name. The cognomen Popaja is habitual in Bosnia and Herzegovina, where it is quite a rare surname, Denmark, where it is a rare surname, and Sweden. In absolute terms, it most frequently occurs in Bosnia and Herzegovina, the United States, and Sweden.
| VARIANT | COUNTRY |
|---|---|
| Popaja | Bosnia and Herzegovina, Sweden, Austria, United States, Denmark |