This is the 4892nd most frequent Swedish word.
birgit
"Birgit" is a Swedish female given name, derived from the Irish name Brigid, meaning "exalted" or "strength."
In this sentence, 'Birgit' is used as a proper noun, referring to a person's name, specifically, the subject who loves reading books.
Birgit älskar att läsa böcker.
Birgit loves to read books.
Here, 'Birgit' is again a proper noun, serving as the indirect object of the sentence, who is being informed about the party.
Jag berättade för Birgit om festen.
I told Birgit about the party.
In this example, 'Birgit' is used as a proper noun within a question to identify the individual leading the meeting today.