Sadie started as a nickname for Sarah, but their images couldn't be more disparate. Where Sarah is serious and sweet, Sadie is full of sass and spunk.
Sadie now ranks at Number 124--exactly where she was in her heyday of 1914. She's been chosen for their daughters by Adam Sandler and Christina Applegate, among others.
In popular culture, there's Somerset Maugham's Sadie Thompson, portrayed by Joan Crawford in Rain, Sadie Hawkins Day, where the girls get to ask the boys to dance, and songs like the Beatles' Sexy Sadie.