This is the 3443rd most frequent German word.
katja
"Katja" is a German female given name, equivalent to "Kate" or "Katie" in English.
In this sentence, 'Katja' is used as a proper noun referring to an individual by name.
Katja ist eine freundliche Person.
Katja is a friendly person.
Here, 'Katja' is a proper noun, specifically someone's name, used as a direct object in the sentence following the verb 'gesehen' (seen).
Hast du Katja gesehen?
Have you seen Katja?
In this example, 'Katjas' is used possessively to indicate ownership, showing that the cat belongs to Katja.