This is the 8920th most frequent Polish word.
sijtsma
"Sijtsma" is not a Polish word; it appears to be a Dutch surname.
Here, 'Sijtsma' is used as a proper noun, specifically a surname.
Sijtsma jest popularnym nazwiskiem w Holandii.
Sijtsma is a popular surname in the Netherlands.
In this sentence, 'Sijtsma' is again a proper noun, referencing a potential surname someone might have.
Czy znasz osobę o nazwisku Sijtsma?
Do you know a person with the surname Sijtsma?
The word 'Sijtsma' in this context is used as a family name, referring to a specific group of individuals.