This is the 5704th most frequent Swedish word.
hallberg
"Hallberg" is not a common Swedish word; it is typically a surname.
In this sentence, 'Hallberg' is used as a proper noun, referring to an author or person whose book is mentioned.
Hallbergs bok blev en bästsäljare.
Hallberg's book became a bestseller.
Here, 'Hallberg' is a surname used to identify a specific person the speaker interacted with.
Jag träffade Hallberg på konferensen igår.
I met Hallberg at the conference yesterday.
In this context, 'Hallberg' is the name given to a business establishment, specifically an antique shop.