Mine comes from me being a big time day dreamer and when I was younger the TV show, "I Dream of Genie" was popular. Since my name is Jean, I got teased a lot with the phrase, I dream of Jeanie.
After Grey's Anatomy came out with McDreamy, I thought people would think I came up with my name because I thought I was "Dreamy". Believe me, I do not think of myself that way. I am very self conscience and can only dream of the day that I will be fit enough to consider myself "Dreamy" in that way, LOL.
Jean