This is the 9689th most frequent Polish word.
zajkowskiego
"Zajkowskiego" is the genitive or locative form of a Polish surname "Zajkowski," often meaning "of Zajkowski" or relating to someone with that name.
Here, 'zajkowskiego' is used in the genitive case to indicate possession, meaning 'of Zajkowski'.
Dom zajkowskiego znajduje się na wzgórzu.
The house of Zajkowski is located on the hill.
In this sentence, 'zajkowskiego' is again in the genitive case to specify the owner of the book.
Czy mogę pożyczyć książkę zajkowskiego?
Can I borrow Zajkowski's book?
This sentence uses 'zajkowskiego' in the genitive case to indicate whose party it was.