This is the 8729th most frequent German word.
kristina
"Kristina" is a proper noun, specifically a personal name, and does not have a definition beyond being used as a name.
Here, 'Kristina' is the subject of the sentence, representing a proper noun that refers to a person.
Kristina geht heute einkaufen.
Kristina is going shopping today.
In this sentence, 'Kristina' is used in the genitive case to indicate possession of the book.
Das Buch von Kristina liegt auf dem Tisch.
The book by Kristina is lying on the table.
In this case, 'Kristina' is in the accusative case as it is the direct object of the verb 'gesehen'.