This is the 7506th most frequent Russian word.
джессика
"Джессика" is the Russian transliteration of the English name "Jessica."
Here, 'Джессика' is a proper noun functioning as the subject of the sentence.
Джессика любит путешествовать по миру.
Jessica loves to travel the world.
In this sentence, 'Джессика' acts as a predicate nominative, providing the name of the person referred to.
Мы встретили девушку по имени Джессика.
We met a girl named Jessica.
Here, 'Джессике' is in the dative case, indicating the indirect object of the action.