This is the 6571st most frequent Polish word.
danielewicz
"Danielewicz" is a Polish surname, meaning "son of Daniel."
Here, 'Danielewicz' is used as a proper noun indicating the surname of the author.
Danielewicz napisał piękną powieść o przyjaźni.
Danielewicz wrote a beautiful novel about friendship.
In this sentence, 'Danielewicz' is again used as a surname, reflecting how surnames are often referenced in Polish to identify individuals.
Widziałem dzisiaj Danielewicza w parku.
I saw Danielewicz in the park today.
Here, 'Danielewicz' indicates the surname of the author whose book is being referred to.