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.

The ultimate nicknamey name, à la Ziggy Stardust or the comic-strip character Ziggy. Then again, there's Ziggy Marley, and most anything Marley is cool. Originally named David, his father Bob Marley gave him the nickname "Ziggy" due to the soccer move of the same name.