Fiona entered the American consciousness with the opening of the 1954 Broadway musical Brigadoon, but didn't come onto the U.S. popularity list until 1990.

Nola, a name with a sleek, enigmatic quality, was used for the much-pursued heroine of Spike Lee's 1986 breakout film, She's Gotta Have It, and again by Woody Allen in Match Point. It's a short form of the traditional Irish name Fionnuala. Nola reentered the US Top 1000 in 2008, for the first time in 50 years.

The Scottish Eileen was a midcentury darling that was on a long downward slide for decades. And then, in 2012, it took an unexpected pivot and has been inching upward in the US. The unrelated but similar-sounding Isla may have revived the taste for Eileen. Isla along with Lee and Lena might be nicknames for Eileen. Eileen is an Anglicized form of the Gaelic Eibhlin or Aibhilin, which is technically a form of to Evelyn/Aveline, but is also sometimes considered part of the Helen family of names. Aileen is the Irish version, less popular now than Eileen.

Ferelith is an unusual yet deeply-rooted Scottish girl's name, also found in ancient Ireland and drawn from the Gaelic Forbhlaith or Forbflaith. While it went through a period of dormancy after the Middle Ages, there are some modern women named Ferelith, including actress Ferelith Young and Princess of Denmark Anne Ferelith Fenella Bowes-Lyon.

Callen is a unisex Gaelic name growing in popularity here. Its newfound trendiness is possibly related to the Chris O'Donnell character on "NCIS: Los Angeles", known only as G. Callen. Jazz musician Cal Tjader's full name is Callen.

Cael is the name of the angel of the zodiac sign of Cancer and also of a warrior of Irish mythology. Its ascendance to the Top 1000 over the past decade probably has to do with its similarity to Cale and Kale (and Kyle and Cayden etcetera).

Mirren is a lively and attractive Scottish name, popular in its native country but best known outside Scotland as the surname of the English actor Dame Helen Mirren. It is thought to be a Scottish derivative of the name Marion, from Mary.

Though Eoin is a Gaelic form of John, its Anglicized pronunciation links it directly to Owen. Eoin is currently a Top 30 name in Ireland. Other variations: Ewan, Ewen, Evan and Eoghan (pronounced as Owen but also translated as Eugene).

Caoimhe, pronounced (more properly) kwee-va or kee-va, is a pretty and distinctive Gaelic name but one that could well lead to no end of confusion outside the Irish community. Even in its native habitat, it is sometimes spelled Keeva.

Pronounced like Owen, this was the name of several early Irish kings and saints, as well as a celebrated Ulster hero. Often spelled with two 'n's in Scotland, it has been Anglicized as Ewan, Ewen, Euan, Owen, Hugh, or Eugene.

The 6th century Irish saint Mirin emigrated to Scotland and now is the patron saint of both the Glasgow suburb of Paisley and the game of football.

Aodh, the name of the Celtic sun god meaning "fire", was common in early Scotland. It's also the origin of the wildly popular Irish name Aidan (originally Aodhán). Its pronunciation varies depending on region: AY or EE are Irish pronunciations, and in Scotland it's closer to UH, and has been Anglicized as Hugh.

Derived from the Scottish Gaelic bàn, meaning "white, fair". It's also a name in J. R. R. Tolkien's fictional Elvish language, in which it means "beautiful".

Long popular in Ireland and England, Ciarán is the name of Ireland's first-born saint and twenty-five other saints. While this is the authentic Irish spelling, it is more familiar in the US in the Anglicized Kieran spelling.

Maebh is an ancient feminine Irish name pronounced similar to 'Maeve.' It derives from the legendary queen Medb of Connacht in Irish mythology, whose name means 'she who intoxicates' or 'the cause of great joy.' This traditional spelling preserves the authentic Gaelic heritage of the name, whereas Maeve is the more anglicized version. Maebh carries strong connotations of strength, independence, and feminine power, as Queen Medb was known for her strong will and warrior spirit. While rare outside Ireland, the name has maintained a steady presence in Irish naming traditions. Its brevity and rich cultural significance appeal to parents seeking an authentic Celtic name with historical depth and powerful feminine associations.

The traditional Irish girl's name Bevin – an Anglicization of Bébhinn – is rarely heard outside the Emerald Isle, but could make an fresh and fashionable namesake for an Aunt Beverly.

Mirren is a lively and attractive Scottish name, popular in its native country but best known outside Scotland as the surname of the English actor Dame Helen Mirren. It is thought to be a Scottish derivative of the name Marion, from Mary.

Iain, this authentic Gaelic form of John, has been well used in Scotland since the early twentieth century, used concurrently with the shortened Ian spelling, but is rarely seen in the US.

Both Caitriona and Catriona are commonly heard in Scotland and Ireland. The name was brought to Ireland by the Anglo-Normans, and is the source of nicknames Cait, Caitin, Caitlin and Triona. Actress Caitrona Balfe has gained recognition for her role on Outlander. Pronunciation is like Katrina.

The 6th century Irish saint Mirin emigrated to Scotland and now is the patron saint of both the Glasgow suburb of Paisley and the game of football. Mirren is one modern spelling; the Cornish Merryn, best known as the name of the seacoast town St. Merryn, is also related. The name is usually used for girls.