This is the 5193rd most frequent Catalan word.
barty
It seems "barty" is not a Catalan word.
In this sentence, 'Barty' is a proper noun used as the name of a person.
Vaig conèixer en Barty a la festa d'aniversari.
I met Barty at the birthday party.
Here, 'Barty' again functions as a proper noun referring to a character or individual whose story captivates the speaker.
La història de Barty sempre em fascina.
The story of Barty always fascinates me.
'Barty' is utilized as a proper noun indicating authorship or association with specific books, likely written by a person named Barty.