This is the 6782nd most frequent Catalan word.
susana
"Susana" is a proper noun; it is a Catalan feminine given name equivalent to "Susana" or "Susan" in English.
In this sentence, 'Susanna' is used as a proper noun to refer to a person's name.
Susanna va arribar tard a la reunió.
Susanna arrived late to the meeting.
Here, 'Susanna' is used as the subject of the clause, specifying the writer of the book.
El llibre que va escriure Susanna és molt interessant.
The book that Susanna wrote is very interesting.
In this instance, 'Susanna' is mentioned as the recipient of the action or message.