This is the 121st most frequent Catalan word.
sánchez
"Sánchez" is not a Catalan word; it is a common Spanish surname.
Here, 'Sánchez' is used as a proper noun, representing a person's name.
En Sánchez va arribar a l'escola més tard que els altres.
Sánchez arrived at school later than the others.
In this sentence, 'Sánchez' denotes the author of the mentioned book, again acting as a proper noun.
El llibre escrit per Sánchez és molt interessant.
The book written by Sánchez is very interesting.
Here, 'Sánchez' is referred to as a topic of interest, implying its usage as a proper noun or specific identification.