This is the 766th most frequent Danish word.
jan
"Jan" is a common male given name in Danish.
The word 'Jan' is still functioning as a proper noun in this context, showing how it is used in direct address.
Kan du tage dig af det her, Jan?
Can you take care of this, Jan?
In this context, 'Jan' is a proper noun, referring to a person's name.
Jan er en dygtig lærer.
Jan is a skilled teacher.
Here, 'Jan' is again used as a proper noun, referring to the same person's name mentioned previously.