This is the 520th most frequent Catalan word.
miquel
"miquel" is the Catalan form of the proper name "Michael."
Here, "Miquel" is used as a proper noun indicating a person's name.
En Miquel va al mercat cada dissabte.
Miquel goes to the market every Saturday.
In this sentence, "Miquel" acts as the subject of the sentence referring to the author of the book.
Aquest llibre l'ha escrit en Miquel.
This book has been written by Miquel.
Here, "Miquel" is the object of the verb "conec" (I know).