This is the 6015th most frequent Catalan word.
jürgen
The word "jürgen" is not a Catalan term; it is typically a German given name.
Here, 'Jürgen' is used as a proper noun, specifically a personal name of German origin, explaining its familiarity.
Jürgen és un nom alemany molt familiar.
Jürgen is a very familiar German name.
In this example, 'Jürgen' again functions as a proper noun indicating the author of the book mentioned.
El llibre que en Jürgen va escriure s'ha convertit en un best-seller.
The book that Jürgen wrote has become a bestseller.
Here, 'Jürgen' is used to refer to a person met during the trip, hinting at an individual with this German name.