Once a popular choice in for boys in the Middle Ages and again during the 19th century, Aubrey has mostly been used for girls in the US since the 1970's. With its arty, surname-y, and sophisticated feel, however, it is rising up the UK charts for both boys and girls.

Marlow is a suave, unusual surname-name that was chosen by Celine designer Phoebe Philo for her older son. This is a name with many spellings and many difference in gender identity. Marlowe is decidedly female, with only 10 percent of the babies named Marlowe male, while Marlow is 25 percent male, and Marlo is evenly divided.

As sturdy as Oak, but with stronger roots as a first name, Oakley ticks lots of boxes for modern trends. With its unisex vibe, its nature-based meaning, its surname-y feel, and its popular -lee ending, it's not wonder Oakley is on the rise.

Wallace is so square could almost be ripe for a turnaround, especially with the hipness imparted by the British Claymation series Wallace & Gromit. And Wally makes an adorable Leave it to Beaver retro-style nickname.

Jethro, though the biblical father-in-law of Moses, has suffered for a long time from a Beverly Hillbilly image, but some really adventurous parents might consider updating and urbanizing it and transitioning it into the hip o-ending category.

Hart could be the hero of a romantic novel, but on the other hand, it's short, straightforward, and strong sounding. The most famous bearer of the name was tragic poet Hart (born Harold) Crane, but it also has musical cred via Lorenz Hart, of the classic Rodgers & Hart songwriting duo and a literary tie to playwright Moss Hart.

Among the coolest of the cool color names, particularly popular with celebs as a unisex middle name. While most famous as the name of Beyonce and Jay-Z's daughter Blue Ivy, more than 60 percent of the babies named Blue are boys.

Once an upper-class British surname conjuring up the epic poetry of John Milton, it then descended to the antics of "Uncle Miltie" Berle, and now has left the stage completely.

Lucan is a rarely heard Irish name, a Luke form with the trendy an ending.

Boys' names beginning with "El" were all the rage in the 1910s, but today Elmore - along with Elwin, Ellsworth and others - has barely been used for decades. It has literary connections through writer Elmore "Dutch" Leonard. More recently, several children's book characters have given the name a cuddly feel: Holly Hobbie's Elmore the Porcupine, and Elmore Green in Lauren Child's "The New Small Person".

Ancient Athenian statesman whose name was once used in the US mostly for enslaved people, following a trend for names of ancient figures.