Ailbhe is a unisex Irish name that has appeared throughout Irish history, borne by a 6th-century (male) saint, and by a female warrior of Fianna, a legendary group of women warriors, led by Fionn MacCumhaill. Today, the name is predominantly used for girls, likely because it sounds similar to Alma, Ava, and Alba.

The Irish name given to Miranda Hobbes's son on the dearly departed Sex and the City is a friendly and energetic choice. You well might want to make your son part of the Brady bunch.

Spirited and bubbly, but handsome and preppy too, Darby is a surname style choice that fits in well with the likes of Alby and Lennox.

Once the quintessential bouncy teenager name, Kelly helped launch the trend of unisex Irish names . But it now takes a backseat to more substantial surname names like Kennedy.

Tiernan is the slightly edgier and sharper cousin of Kiernan. This is one Irish surname that is attractive but distinctive; Tierney is another, related, option.

Used far more for boys with this spelling, but still has a nice impish Irish feel for a girl.

This attractive surname name still projects that Kennedy family charisma. While it didn't come into widespread use until long after the deaths of martyred heroes President John F. or Senator Robert Kennedy, Kennedy is now one of the most popular unisex names for girls as well as the top girls' name starting with K. This is one name that manages to sound trendy and classic at the same time.

Brogan is a cheerful Irish surname that would fit right in with the Logans and Br-starting names now trendy for boys. It's been on the pop list for the past three years, though it's sliding again. Its history includes Saint Brogan (Broccan in Gaelic), who was Saint Patrick's nephew and scribe.

A name with a bit of glamor but also cowgirl vibes, Dallas entered the US Top 1000 for girls in 1992. It fell out of style during noughties, but reappeared in 2012 when other gender neutral names like River, Sawyer, Rowan, and Blake were also climbing fast.

One of the original unisex Irish surname names, energetic Casey bounced onto the scene in the 1960s, then peaked in the 1980s for both boys and girls. Today Casey is having a resurgence for both girls and boys and re-entered the charts on the girls' side, likely due to the character Kayce Dutton (pronounced like Casey) on the hit show Yellowstone.

The additional syllable makes Lark a masculine surname name, borne by poet Philip Larkin.

A winning last-name-first Celtic choice, Flynn is still mostly used for boys, such as the son of Orlando Bloom and Miranda Kerr. Though Flynn is definitely one of the Irish surname names, from Quinn to Flannery to Makenna, that makes one of the trendy boy names for girls".

Brennan is a winning Irish surname name, more modern than Brian or Brendan, more unusual than Conor and Aidan. The only possible problem with Brennan: people might think you're saying Brendan.

The most enduringly popular hero of Irish myth was Finn McCool, whose name is one of the coolest ever. When used for the female protagonist of How to Make an American Quilt, Finn established its hipness for girls as well.

An uncommon Irish-accented surname that seems particularly well suited to a girl. Tierney Sutton is a well-known jazz singer. Tierney, in its original Tiarnach form, was the name of several saints. It can also join the ranks of Old Hollywood names, via the haunting actress Gene Tierney. ER actress Maura Tierney is a current surname bearer. 

Bellamy is emerging as an up-and-coming girls' name, an Irish surname-y riff on the super-popular Bella series of names. While the Bella connection makes Bellamy sound a little trendier and more popular than it really is, we see the name possibly rising through the ranks for both genders in the coming years.

Upper crust-y surname Sheridan gains some energy when used for a girl.

Kerry is the name of one of the most beautiful and lush counties of Ireland was a seventies favorite. Related, updated versions might include Cerys and Keira.

Spunky Irish surname that still has a pugnacious feel from its lingering association with one of boxing's greatest champs, Jack Dempsey. Many people may associate it more with Patrick Dempsey these days—McDreamy from TV's Grey's Anatomy.

Long before the vogue of using Irish surnames for girls, writer Flannery O'Connor gave this one some visibility. It has a warm (flannelly) feel and the currently popular three-syllable ee-ending sound.