Billie as a masculine name originated as a diminutive form of William, derived from Germanic elements meaning "will" or "determination" and "helmet" or "protection." While more commonly recognized as a feminine name today, Billie has historical precedence as a male name, particularly in the early to mid-20th century. Notable male bearers include jazz musician Billie Holiday (born Eleanora but adopted the masculine spelling) and various athletes and musicians. The name conveys a friendly, approachable quality with vintage charm. Though its popularity for boys has declined significantly since the 1960s, it maintains appeal for parents drawn to gender-neutral naming options with traditional roots and a casual, unpretentious character.

Seinfeld's George threatened to name his future child Seven, and then singer Erykah Badu actually did it.

Likely a variation of the Greek name Xenia, Xena is associated with the the TV Warrior Princess, played by Lucy Lawless back in the 90s. Also used as a diminutive form of Alexina or Zenobia, the name was used as a nickname, or temporary name, for the minor planet now known as Eris. It was chosen when it was still being decided how Eris would be classified, and was selected because it began with X and had the mythological, TV connection.

This choice feels more familiar than other hall-related English surnames, thanks to designer Halston, the single-named disco-era society playmate of Liza and Elton.

Puck was Shakespeare's mischievous pixie who'a had a few television incarnations in more recent years. A popular name in The Netherlands but nowhere else, from what we can tell.

Guthrie, one of the most attractive Scottish names that's also a surname, has a particularly romantic, windswept aura, with a touch of the buckaroo thrown in.

An Ethiopian place-name and multicultural diminutive for many names, including the Slavic Tatiana and the Spanish Cayetana. Tana is also a rare Frisian name, meaning "thought", as well as a masculine name meaning "sweetheart" in the Turkic Karachay-Balkar language.

In Norse mythology, the valkyries decided the fate of men in battle and conveyed the spirits of the fallen to Valhalla, to dwell with the god Odin. Often associated with ravens, swans, and horses, over time the valkyries have been portrayed as strong, female figures, callous and monstrous creatures, and sometimes both at the same time.

One of several similar feminine names often found in the Muslim world but also a Native American name. And in Greenlandic, Naja means "a boy's younger sister", which could be a sweet connection to a big brother. It's a relatively popular name in Denmark.

Asking for trouble. Rebel Wilson is female, but this name is truly gender neutral, though hardly neutral in any other way. Rebel is undoubtedly one of the edgiest boys' names starting with the letter R.

While the most famous Channing is the very male Channing Tatum, the name is now given about a third of the time for girls. Television executive Channing Dungey is a well-know example of a female Channing. It makes an attractive surname-name for either gender.

Io may be one of the slightest names in the book, but there aren't many two-letter names with as much substance as this Greek mythological example. Io, a name used for the largest moon of Jupiter, was in classic myth raped by Zeus and escaped from him by changing herself into a cow.

Audacious offshoot of Roxanne, the wayward heroine of the musical Chicago.

Kieran is a boys' name that could cross over, as an update of outmoded Karen or a variation on trendy Kiera (or Keira or Kyra). Keren Ann is an Israeli-born singer. The proportion of babies named Kieran who are girls is less than ten percent, but is slowly growing. Kieran had an increase in use for girls in 2022.

Cooler than the older month names like April and May, and a highly unusual and eye-catching choice. The most famous real-life January is female – January Jones – but the month is named for the Roman god Janus, who presided over doors and new beginnings.

The meaning of this rare Irish name is not fully known. It may mean "man of god", or else derive from an element meaning "smoke". In Irish mythology, this was the name of a warrior who was killed by his friend Cúchulainn. Vikings actor Ferdia Walsh-Peelo is a famous bearer.

Angel is one of those names that has a very different trajectory for girls and boys. As a female name, it was most popular in the US from the 1970s until the turn of this century, almost breaking into the Top 100 at its peak in 2001 but then beginning a long slide down the list.

Mostly feminine, though "Office" star Rainn Wilson gives it a slight masculine twist. You might also use this as a short form of Raines.

Peach is one of those names that, a generation ago, would have been placed in the wacky celebrity baby name category. But now with the proliferation of word, nature, and yes, food names, Peach sounds adorably baby-ready.

The unusual-to-the-English-ear Moritz is a Top 25 name in Austria and a form of Maurice or Morris, which are modern variations of the ancient Roman Maurus. There were several early saints named Maurus and a famous 3rd century Saint Maurice, who was a Roman infantryman who was martyred when he refused to worship Roman gods. The Moritz form also references the posh Swiss ski resort St. Moritz and Justine Moritz is a character from Mary Shelley's novel, Frankenstein.