This is the 6706th most frequent French word.
katalin
"Katalin" is not a French word; it is a Hungarian given name.
Here, 'Katalin' is used as a proper noun referring to a person's name.
Katalin est une amie qui habite à Paris.
Katalin is a friend who lives in Paris.
In this sentence, 'Katalin' refers to the author of the book, emphasizing the possessive relation.
Je vais lire le livre écrit par Katalin.
I am going to read the book written by Katalin.
The use of 'Katalin' here highlights her role as an actor in the action of visiting.