This is the 7747th most frequent Polish word.
mamardaszwili
"Mamardaszwili" is not a Polish word; it appears to be a Georgian surname.
Here 'Mamardaszwili' is used as a proper noun, the name of a specific individual.
Mamardaszwili był znanym gruzińskim filozofem.
Mamardaszwili was a renowned Georgian philosopher.
Here 'Mamardaszwilego' is the genitive case form of 'Mamardaszwili', indicating possession or authorship.
Czytałem książkę Mamardaszwilego o filozofii.
I read Mamardashvili's book on philosophy.
In this sentence, 'Mamardaszwilego' represents the individual Mamardashvili as a possessor connecting to the concept of a philosophy.