See the popularity graph below for the name Theo? It's been heading straight uphill since 2010, when it hopped back onto the Top 1000 after a 60+ year absence.

Rosalie hit its apex in 1938 and then slid straight downhill until it fell off the U.S. Top 1000 completely in the 1980s, only to spring back to life in 2009 as the name of a character in the Twilight series. The beautiful vampire Rosalie Hale has breathed fresh life back into this mid-century name, and the fact that the character is both sympathetic and relatively minor means Rosalie has the chance to thrive again as a baby name without feeling unduly tied to Twilight.

Wynn is an attractive Welsh name, originally male but now also used for girls outside of Wales. The authentic feminine version would be Gwen, which derives from the same very productive gwyn element, making it a relative of all Welsh names ending -wyn or -wen, as well as the Irish Fin- names.

Liv combines the succinct charm of a nickname—people might assume it's short for Olivia—with the solidity of being a classic stand-alone Scandinavian name with a life-force meaning. It was brought into the public eye (in the English speaking world that is) due to the fame of actress and Aerosmith daughter Liv Tyler.

Iver is a popular name in its native Norway, but parents in the U.S. are starting to take note of this rugged yet gentle name. Stemming from the original Norse name Ívarr, it is part of a small group of names with similar roots: Ivar, Ivor, Ivo, Ives, and Evander. It was brought to England by Scandinavian settlers in the Middle Ages, and to the US by in the 19th century.