This is the 9362nd most frequent Polish word.
urbanowicz
"Urbanowicz" is a Polish surname meaning "son of Urban."
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.
Czy znasz Urbanowicza?
Do you know Urbanowicz?
In this sentence, 'Urbanowicz' is used as a Polish last name, identifying a person named Urbanowicz.