This is the 9362nd most frequent Polish word.
urbanowicz
"Urbanowicz" is a Polish surname meaning "son of Urban."
In this sentence, 'Urbanowicz' is used as a Polish last name, identifying a person named Urbanowicz.
Urbanowicz mieszka w Warszawie.
Urbanowicz lives in Warsaw.
Here, 'Urbanowiczem' is the instrumental case form of the last name 'Urbanowicz', indicating the person with whom the friendship is shared.
Przyjaźni się z Urbanowiczem.
He is friends with Urbanowicz.
In this usage, 'Urbanowicza' is the accusative case form of 'Urbanowicz', denoting the one being known.