This is the 3672nd most frequent Polish word.
janusza
"Janusza" is the genitive singular form of "Janusz," a male given name in Polish, often colloquially used to stereotype an unsophisticated or ignorant man.
In this sentence, 'Janusza' is the accusative case of the name 'Janusz', used as the direct object of the verb 'notice'.
Janusza zauważyłem wczoraj na spacerze.
I noticed Janusz yesterday during a walk.
Here, 'Janusza' represents the genitive case of the name 'Janusz', indicating possession or association.
Zabrałem książkę od Janusza.
I took the book from Janusz.
In this example, 'Janusza' is used in the genitive case after the preposition 'przyjacielem', which requires the genitive form to denote 'of Janusz'.