This is the 9527th most frequent Polish word.
witkowska
"Witkowska" is a Polish surname, a feminine form of "Witkowski."
Here, 'Witkowska' appears as a proper noun, representing a surname in its nominative feminine form.
Anna Witkowska jest znaną pisarką.
Anna Witkowska is a well-known writer.
In this sentence, 'Witkowska' has been used adjectivally as part of a proper noun phrase, deriving from a surname to describe the collection.
Czy wiesz, że kolekcja Witkowska została wyróżniona?
Do you know that the Witkowska collection has been awarded?
Here, 'Witkowska' modifies the noun 'Dolina,' turning it into a proper noun that specifies a location, the form being feminine and genitive or nominative, depending on the context.