This is the 7423rd most frequent Russian word.
грег
The word "грег" does not have a meaning in standard Russian; it may be a typo or a name.
The word 'грег' is used here as a proper noun, the name of a person.
Грег любит музыку.
Greg loves music.
In this sentence, 'грег' continues to act as a proper noun, providing the name of the subject being described.
Мой друг по имени Грег собирает марки.
My friend named Greg collects stamps.
Here, 'Грега' is the accusative case form of the proper noun 'Грег', as it functions as the direct object of the verb 'met'.