This is the 3315th most frequent Russian word.
парня
"Парня" translates to "guy" or "young man" (accusative case of "парень").
The word 'парня' is the accusative case of 'парень', used here as the object of the verb 'вижу' (to see).
Я вижу парня около магазина.
I see the guy near the store.
'Парня' is in the accusative case, referring to the object of the sentence, whom the person knows.
Ты хорошо знаешь этого парня?
Do you know this guy well?
Here, 'парня' is used in the genitive case, showing possession or relation.