It may have peaked at #1 for girls in 1991 and 1992 in the US, but Ashley actually has a long history as a male given name, as evidenced by the sensitive Ashley Wilkes in Gone With the Wind. It's always been more popular for boys in England and Wales, where it currently ranks at #414.

Ashley

Alice

April

Audrey

One of the first generation of cool surname names, now largely used for girls in the US, but still popular for boys in its native Scotland. A prominent association for Brits is former prime minister Tony Blair, who was leader at the time of the Iraq War.

Blair

Briar

Clover

Baby girl Danas outnumber baby boys with the name nearly ten to one. But Dana is an attractive, sleek name that can certain work for babies of either gender.

Dana

Grace

Harper got its start as a celebrity baby name when Paul Simon chose it for his now-grown son. Since then, other famous parents have followed suit: musician Tim Finn and actor Cecilia Peck both have sons called Harper.

Other high-profile Harpers, like author (Nelle) Harper Lee and starbabies Harper Burtka-Harris and Harper Beckham, are female, but it makes a handsome choice for either sex (and is in the US Top 1000 for both boys and girls).

Harper

Iris

Justice, one of the rare virtue names for boys, entered the popularity ranks in 1992, and has remained on the list ever since. Parents' search for names implying virtue has led to a mini-revival of this long-neglected name in both its German homonymic form, Justus, and as the word itself. Steven Seagal was ahead of the curve when he used it back in 1976.
 Another plus: Justice is one of the truest nonbinary names, given to nearly equal numbers of girls and boys in the US.
 With the Justus spelling, it was the name of several saints and noted scholars and scientists.

Justice

Jade

Jayne

A musical name that's more popular for girls, but has been hovering just inside the Top 1000 for boys since 2007.

Lyric

Lavender

Mallory

The first famous Paris was a mythological prince of incredible beauty. The most recent was media darling Paris Hilton, inspirer of a generation of baby-girl namesakes. But since Pierce Brosnan and other celebs have continued to use it for their sons, the name retains some masculine identity. For girls, it jumped from #464 to #412 in the past year alone. 

Paris

Petra

Quinn is an engaging Celtic surname that is still on the rise for girls but beginning to flag for boys. As a female name, Quinn is in the Top 100, used for over 3000 baby girls last year, but toward the bottom of the Top 500 for boys, given to 700 baby boys.
Pop culture was an important influence on Quinn's popularity for both genders. Quinn started leaning decidedly toward the feminine thanks to a female cheerleader character on the television show Glee. For boys, Quinn's popularity was influenced by "The Mighty Quinn," the name of a movie, a band, and a Bob Dylan song. 
 Sharon Stone has a son named Quinn. Other ideas for boyish names like Quinn: Quinton, Quincy, Finn.

Quinn

Make that bird name, and while it does work for both genders, it's far more popular for girls, via Raven Symone. 

Raven

Fits many criteria sought by modern parents: it's short and strong, with intimations of wisdom as well as fragrant herbal properties.  At this point, Sage is given about a third of the time to boys.



Sage

The name of the longest river in the British Isles rose to the US Top 25 for girls in the 1970s and the Top 100 for boys, but has fallen off the Top 1000 for both genders. At the latest count, the name Shannon was given to about 200 babies in the US, about a third of those boys. 

As a favorite Irish name, Shannon has now been supplanted by newcomers such as Saoirse and Seanan.

Shannon

A contraction name, Sidney comes from Saint Denis and is related to Dioynsius, the Greek god of fertility and wine, although another theory is that it derived from an Anglo-Saxon place name, meaning 'at the wide island.' Sidney is an aristocratic British surname--as in the Elizabethan poet George Sidney-- and later attained a further measure of distinction through its association with the self-sacrificing hero of Dickens's A Tale of Two Cities, Sidney Carton, and with Oscar-winning actor Sidney Poitier. 
 In the US, Sidney was most popular in the 19-teens, when it was in the Top 100 for that decade, but has gradually declined, especially after the girl's name Sydney burst into popularity in the 1990's.

Sidney

An Irish surname-name that's used almost exclusively for girls these days.

Sloane

Soleil

Deriving from the Roman cognomen Vivianus, Vivian was originally a masculine name, with Vivien being a feminine soundalike coined by Alfred Lord Tennyson for the Lady of the Lake in his famous poetic adaptation of the legend of King Arthur. It has since become a much more popular choice for girls in the US, but retains a refined British charm which sees it cropping up occasionally for boys in the Telegraph birth announcements. Fun fact: Vivian is the middle name of Daniel Cleaver, Hugh Grant's rakish character in the Bridget Jones movies.

Vivian

Deriving from an English locational surname meaning "white island", Whitney was in rare but regular use for boys in the US until the early 1960s, when actress Whitney Blake popularized it for girls. It received a further big boost on the girls' side in the 1980s, thanks to singer Whitney Houston. Now falling rapidly down the rankings, it could be time to reclaim this one for the boys, if only as a neat way to cool-guy nickname Whit.

Whitney

Willow

lucykath's list "Feminine Names For Boys" of 29 great name ideas: Ashley - Willow!

Feminine Names For Boys

Girls get boys names all the time. These are some unisex and girly names I think would work for boys.