This is the 7420th most frequent Polish word.
kolstad
"Kolstad" is not a Polish word. It appears to be a surname or name of Norwegian origin.
In this sentence, 'Kolstad' refers to the proper noun for a specific town.
Kolstad to piękne miasto w Norwegii.
Kolstad is a beautiful town in Norway.
Here, 'Kolstad' is used as a surname, indicating its use as a family name.
Mój przyjaciel nazywa się Kolstad, to bardzo popularne nazwisko.
My friend's surname is Kolstad, it is a very popular name.
In this context, 'Kolstad' identifies a sports club associated with the name.