The Beatles

Robert was the Number 1 boys' name in the US in both 1925 and 1950, and in fact was in the Top 25 for more than a century, giving it true classic status. Strong if not quite stylish, Robert remains in the Top 100 for baby boys as a family favorite.

How many decades will it take for Rocky to triumph over its association with Sylvester Stallone's battered but not beaten boxer? The moment may have come, now that Sarah Michelle Gellar and Freddie Prinze Jr. have named their son Rocky. It helps, too, that Madonna's son Rocco helped make the name child-appropriate again.

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 fun.

Sean, after a long reign as one of the top Irish boys' names in the US, has now slipped as parents look to fresher Irish choices such as Liam and Aidan. In Ireland, Sean is still highly popular, but variation Senan, an Anglicized spelling of diminutive Seanan, is also stylish in Ireland. While Sean is the Irish form of John, Seanan and Senan may be thought of either as Sean diminutives or relatives of the Latin word "senator".

Stella is a name with star quality and sparkle, that manages to sound both ethereal and earthy. Celestial but not otherworldly, it lands somewhere between the popular Ella and bold Seraphina.

There are many in Japan, but for most Americans there's only one Yoko.

This zippy short form of Zachary is more and more often standing on its own -- sometimes as Zac, Zach, Zack, or even Zakk -- but this simple-yet-straightforward version may be the very best.