This is the 427th most frequent Catalan word.
carles
"Carles" is a Catalan proper noun, equivalent to "Charles" in English.
Here, 'Carles' is a proper noun used as a person's name.
Carles és el meu millor amic.
Carles is my best friend.
In this sentence, 'Carles' still refers to a proper noun, but it includes the Catalan definite article indicating familiarity ('en Carles').
Vam anar amb en Carles al cinema.
We went to the cinema with Carles.
Here, 'Carles' is the subject of the phrase, introduced by the possessive relationship.