This is the 5051st most frequent Swedish word.
carsten
"Carsten" is a male given name of Scandinavian and German origin.
Here, 'Carsten' is used as a proper noun referring to a person, specifically someone's first name.
Carsten är en arkitekt som bor i Stockholm.
Carsten is an architect who lives in Stockholm.
In this sentence, 'Carsten' again serves as a proper noun, naming an individual who was met at a social event.
Vi träffade Carsten på festen igår.
We met Carsten at the party yesterday.
The proper noun 'Carsten' is mentioned in a possessive context, referring to the projects owned or related to the person named Carsten.