Sincere has been a popular name in the African-American community ever since it was the name of the chief character in the 1998 film
Belly:
http://www.imdb.com/title/tt0158493/
Damaje is probably pronounced "da-MAYJ" or "da-MAH-jee".
Utah was the first state where
Jaden and
Caden became generally popular. But these days, I would suspect most really large maternity wards in any large hospital in the western half of the United States that served a predominantly "Anglo" clientele would be just as likely to have as many boys born with Aidan-rhyming names.