This is the 8498th most frequent Russian word.
николаева
"Николаева" is a Russian surname, the feminine form of "Николаев," meaning "of Nikolai" or "belonging to Nikolai."
Here, 'Николаева' is used as a proper noun, representing a person's last name.
Николаева поздравила всех с праздником.
Nikolaeva congratulated everyone on the holiday.
In this sentence, 'Николаева' indicates the author of the book, showcasing its nominative case in use.
Эту книгу написала Николаева.
This book was written by Nikolaeva.
Here, 'Николаевой' is in the instrumental case, signaling the object of the action 'to meet'.