This is the 9068th most frequent Russian word.
руслана
"Руслана" is a Russian female given name.
The word 'Руслана' here is used as a proper noun, referring to a person's name.
Руслана пришла в парк, чтобы встретиться с друзьями.
Ruslana came to the park to meet with her friends.
In this sentence, 'Руслана' is a possessive form, indicating ownership of the book by Ruslana.
Книга Руслана заинтересовала многих читателей.
Ruslana's book attracted many readers.
Here, 'Руслане' is the prepositional form, indicating that Ruslana is the topic of conversation.