This is the 9058th most frequent Polish word.
staszewskiego
"Staszewskiego" is a Polish surname in the possessive or descriptive form, meaning "of Staszewski" or "related to Staszewski."
The term 'Staszewskiego' in this sentence is a genitive case of the noun 'Staszewski', indicating possession or association to Staszewski.
Dom Staszewskiego znajduje się na obrzeżach miasta.
Staszewski's house is located on the outskirts of the city.
Here, 'Staszewskiego' is in the accusative case following the verb 'spotkałeś' (you met), which requires the object of the meeting in accusative.
Kiedy spotkałeś pana Staszewskiego?
When did you meet Mr. Staszewski?
In this example, 'Staszewskiego' is in genitive case as it describes the ownership or relation of the grave to Tomasz Staszewski.