This is the 501st most frequent Romanian word.
bogdan
"Bogdan" is a Romanian male given name of Slavic origin, meaning "gift from God" or "God-given."
Here, 'Bogdan' is used as a proper noun, representing a person's name.
Bogdan este prietenul meu bun.
Bogdan is my good friend.
In this sentence, 'Bogdan' is again a proper noun, referring to the author of the book.
Am citit o carte interesantă scrisă de Bogdan.
I read an interesting book written by Bogdan.
Here, 'Bogdan' is mentioned as a noun indicating the popularity of this name in the Romanian context.