This is the 447th most frequent Swedish word.
uppsala
Uppsala is a city in Sweden.
Here 'Uppsala' is used as a proper noun, specifically the name of a city in Sweden, functioning as a locational identifier in the sentence.
Jag ska åka till Uppsala för att studera.
I am going to travel to Uppsala to study.
'Uppsala' is again a proper noun in this sentence, referring to the city, and is the subject of the sentence.
Uppsala är känt för sitt universitet.
Uppsala is known for its university.
In this instance, 'Uppsala' serves as a proper noun indicating the origin of the friends mentioned, providing geographical context.