This is the 7087th most frequent Russian word.
бибисара
"Бибисара" is a female given name of Kazakh and Central Asian origin.
The name 'Бибисара' is used as a proper noun, referring to an individual's given name in this context.
Бибисара купила книгу.
Bibisara bought a book.
Here, 'Бибисара' remains a proper noun, but it's used in a locative context (about Bibisara).
Я услышал песню о Бибисаре.
I heard a song about Bibisara.
In this sentence, 'Бибисара' is introduced as a new name in the context of describing someone's identity.