This is the 18029th most frequent Polish word.
żeromskiego
"Żeromskiego" is not a standalone word; it is the genitive or locative form of "Żeromski," a Polish surname, often referring to Stefan Żeromski, a notable Polish writer, or places named after him.
Here, 'Żeromskiego' refers to the name of a street named after Stefan Żeromski, indicating its genitive case as part of the place name.
Mieszkam na ulicy Żeromskiego w Krakowie.
I live on Żeromski Street in Kraków.
In this context, 'Żeromskiego' refers to the genitive case of the surname of Stefan Żeromski, indicating possession or authorship of the book.
W księgarni kupiłem książkę Żeromskiego.
I bought a book by Żeromski at the bookstore.
Here, 'Żeromskiego' indicates the genitive case of 'Żeromski', suggesting that the photo belongs to or is of him.