This is the 3905th most frequent German word.
tanja
"Tanja" is a female given name in German.
Here, 'Tanja' is used as a proper noun referring to a person's name.
Tanja ist eine talentierte Musikerin.
Tanja is a talented musician.
In this context, 'Tanja' again functions as a proper noun, indicating the person being referenced in the question.
Hast du Tanja gestern auf der Party gesehen?
Did you see Tanja at the party yesterday?
Here, 'Tanja' is used to refer to the name itself, discussing its etymological origin.