This is the 965th most frequent Croatian word.
andrej
"Andrej" is a Croatian male given name, equivalent to "Andrew" in English.
Here, 'Andrej' is again a proper noun, used within a descriptive clause to identify a person by their name.
Poznajem osobu koja se zove Andrej.
I know a person whose name is Andrej.
In this sentence, 'Andrej' is a proper noun, serving as the subject of the sentence, representing a specific person.
Andrej je jučer išao u kazalište.
Andrej went to the theatre yesterday.
In this instance, 'Andrej' is in its instrumental case form, indicating the person Sanja is interacting with.