This is the 9056th most frequent Polish word.
starzyńskiego
"Starzyńskiego" is the genitive or possessive form of "Starzyński," a proper noun often referring to a surname, typically indicating "of Starzyński" or "related to Starzyński."
Here, 'Starzyńskiego' is used as a proper noun in a genitive form to denote the name of the street 'Starzyński'.
Mieszkam przy ulicy Starzyńskiego w Warszawie.
I live on Starzyński Street in Warsaw.
In this sentence, 'Starzyńskiego' is again a proper noun in the genitive case, used to identify a monument named after 'Starzyński'.
Pomnik Starzyńskiego znajduje się niedaleko mojego domu.
The monument of Starzyński is located near my house.
Here, 'Starzyńskiego' is the genitive form of a proper noun, referring to the person's history.