1) Generally a fancy head dress normally worn by royalty.
2) Also can be a name, particularly for a beautiful girl. Definatly have to fit the part if your going to be a Tiara.
If your name happens to be Tiara then that means your amazingly pretty, GORGEOUS to be exact. Your great in bed and guys & girls find you very sexy. Guys will leave their girlfriends to be with you & girls will go lezz to be yours. The name Tiara, is probably the cutest name ever. I'd advise you name your daughters TIARA.