This is the 366th most frequent Swedish word.
karlsson
"Karlsson" is a Swedish surname meaning "son of Karl."
Here, 'Karlsson' refers to the name of a fictional character from a well-known Swedish children's book.
Jag har läst boken 'Karlsson på taket'.
I have read the book 'Karlsson-on-the-Roof'.
In this case, 'Karlsson' is used to identify a specific person, likely a close acquaintance, by their surname.
Min vän Karlsson älskar att laga mat.
My friend Karlsson loves to cook.
In this sentence, 'Karlsson' is used as a surname, identifying a person by their family name.