This is the 451st most frequent Serbian word.
илић
"Iлић" (Ilić) is a Serbian surname.
In this sentence, 'Илић' is used as a proper noun or surname.
Илић је добар пријатељ.
Ilić is a good friend.
Here, 'Илићи' refers collectively to multiple people belonging to the Ilić family, using the plural form.
Да ли знаш ако су Петровићи или Илићи дошли?
Do you know if the Petrovićs or the Ilićs have arrived?
In this instance, 'Илић' is used once again as a proper noun, but here it refers to an individual possibly in an acquaintance or analytical context.