Baby Number 4

Birdie was until recently a middle-aged Ladies' Club member wearing a bird-decorated hat --but now it's just the kind of vintage nickname (think Hattie, Josie, Mamie, Millie) that's coming back into style in a big way. Actress Busy Philipps named her baby Birdie (inspired by First Lady Lady Bird Johnson), as did soap star Maura West.

Strongly linked in the US to the complex "Star Wars" character, Obi Wan Kenobi, but also popular in Nigeria as a short form of names containing the element Obi "heart".

Wisecracking waitress name stuck in the luncheonette. Started as nickname for girls named Regina -- queen in Latin -- now mostly a canine choice.

Starbaby name that might prove too supercharged for real life, but if like director Robert Rodriguez you're interested only in boys' names starting with R, you may need to add Rocket (and Rebel and Racer) to your list.

Perhaps the ultimate nicknamey name, Ziggy manages to sound cool, cutesy, spiky, and energetic all at once. It brings to mind the glam-rock of Bowie's Ziggy Stardust and the cool vibes of reggae musician Ziggy Marley, along with the contemporary-but-vintage appeal of Teddy, Mack, and Albie.