poreklo

1. (of a person) origin; ancestry; descent
   Moja baka je ruskog porekla. — My grandmother is of Russian descent.
   On ne krije svoje skromno poreklo. — He doesn't hide his humble origins.
2. (of things, words) origin; source
   Na etiketi piše zemlja porekla. — The label shows the country of origin.
   Niko ne zna poreklo te reči. — Nobody knows the origin of that word.

Often used as biti + genitive + porekla: on je srpskog porekla "he is of Serbian descent".