This is the 1478th most frequent Polish word.
jerzego
"Jerzego" is the genitive or accusative form of the Polish name "Jerzy," equivalent to "George" in English.
In this sentence, 'Jerzego' is used in the genitive case to show possession by Jerzy.
Książka, którą czytam, należy do Jerzego.
The book I'm reading belongs to Jerzy.
Here, 'Jerzego' is in the accusative case, as Jerzy is the direct object of the verb 'see'.
Widzę Jerzego na ulicy.
I see Jerzy on the street.
In this example, 'Jerzego' is in the genitive case following the preposition 'dla', denoting 'for Jerzy'.