This is the 18018th most frequent Polish word.
šimonytė
The word "šimonytė" is not Polish; it is Lithuanian and refers to a surname, notably associated with Ingrida Šimonytė, a Lithuanian politician.
Here, 'Šimonytė' is used as a proper noun referring to a specific individual.
Šimonytė jest premierem Litwy.
Šimonytė is the Prime Minister of Lithuania.
In this sentence, 'Šimonytė' is referred to as a surname or family name.
Nazwisko Šimonytė pochodzi z Litwy.
The surname Šimonytė originates from Lithuania.
Here, 'Šimonytė' identifies the author (presumably a person with this surname) of the book.