This is the 732nd most frequent Serbian word.
неком
"Неком" means "to someone" or "to somebody" in English.
The word 'неком' in this sentence denotes an indefinite, unspecified person, functioning as an indirect object in the dative case.
Помогао сам неком детету на улици.
I helped some child on the street.
Here, 'неком' indicates an unidentified recipient, also in the dative case.
Поклонио је књигу неком пријатељу.
He gifted a book to some friend.
In this example, 'неком' is used to express an indefinite, unspecified individual, again serving as the indirect object in the dative case.