This is the 34th most frequent Russian word.
он
"He" (third-person singular masculine pronoun).
In this context, 'он' appears in the form 'него' due to the genitive case in the structure expressing possession.
У него есть машина.
He has a car.
In this sentence, 'он' (he) is used as a subject pronoun referring to a male person performing the action.
Он читает книгу.
He is reading a book.
Here, 'он' (he) serves as the subject within a subordinate clause, expressing the person whose action is anticipated.