Thanks to its dashing British image and c-initialed two-syllable sound, Colin/Collin has enjoyed a long run of popularity. 

Collin

This appealing name of a mythical king of Tara whose reign brough prosperity to his kingdom is strongly associated with actor Sean. The Irish form is Conaire.


Connery

Donnelly is among the more appealing Irish surname names, less well used than Donovan. Related options include the place name Donegal and the mythological god name Donegan.


Donnelly

One of the first of the appealing Irish surnames to take off in this country, this <a href="https://nameberry.com/boys-names">boys’ name</a> has long outgrown its "Mellow Yellow" association, which came via the single from a sixties singer-songwriter named Donovan. 
 Donovan was Scottish-born Donovan Leitch, whose name was probably inspired by his father Donald's. He proved to be an adventurous, celestial namer himself--three of his children are Astrella Celeste, Oriole Nebula and Ione Skye.
 Another potential namesake is retired pro bowl quarterback Donovan McNabb.
 Donovan was in the USA Top 1000 as early as 1900.
 Related options are surname Donegan and place name Donegal.

Donovan

This lilting Irish saint's name shone in neon lights on Broadway for the classical 1947 musical "Finian's Rainbow," later made into a film starring Fred Astaire as Finian McLonergan, and there was also a character on 
"General Hospital" named Finian O'Toole. With the growing popularity of Finn and Finlay/Finley--and boys' names ending in 'an'--Finian, which can also be spelled Finnian, seems like a sure-fire winner. 
 One of several early St. Finnians was a noted teacher and scholar.

Finian

If you like the Finn names and love James Joyce, Finnegan is extremely winning. Will & Grace 's Eric McCormack chose the Finnigan spelling for his son. And of course Finnegan gains you access to the great short form Finn.
 James Joyce took the title of Finnegans Wake from an old Irish-American song.
 Finnegan represents a whole genre of Irish family names you might consider, such as Harrigan, Brannigan, Corrigan, Donegan, Mulligan, Flanagan and Lanigan.

Finnegan

Hurley is a possibility as a unisex surname-name ending with the "lee" sound. It is perhaps most associated with British actress Elizabeth Hurley, and is much rarer than Harley, because the "ur" sound is currently out of fashion (and the word "hurl" may put some off).

Hurley

Keelan is the Anglicized, phonetic form of the more traditionally-spelled Caelan, also in use.  While this name is said by many sources to be unisex, in practice in modern Ireland it is only given to boys.  An interesting, accessible choice largely unknown in the US.

Keelan

Keenen

While Kieran is the class and most-used male form of this name, some people spell it Keiran in keeping with the female Keira, the version popularized by the gorgeous Ms. Knightley.

Keiran

This is one of several similar sounding Gaelic surname names that would make perfectly acceptable choices--others are Kennan, Keenan and Kenyon.  Another possible meaning is "descendant of the fair ones," referring to the Norse invaders.

Kennon

A friendly Irish and Persian name chosen by Geena Davis for one of her twin boys, whose father is Iranian.

Irish and Iranian has to be one of the most diverse pair of roots of any name. Kian can be a variation of the Irish Cian, very popular in its native land. While Cian is fairly rare in the US, Kian has been rising through the ranks for the past two decades. The Irish Cian or Kian is pronounced with the emphasis on the first syllable, KEE-en, rhyming with Ian.

The Iranian Kian is pronounced kee-AHN, like the first two syllables of Keanu as in Reeves.

Spelled Kian, the name is popular throughout the English-speaking world as well as in Germany, Sweden, and Switzerland, but it's impossible to say whether the parents choosing it are going for the Irish or Persian version. Some undoubtedly don't care and simply like the name, no matter what its origin.

Kian

Although this surname name is closely related to the more common Irish name Kieran, Kiernan is also a well used family name, tied to thirty-three ancient chieftains. It has on a few occasions been used for girls.

Kiernan

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

Larkin

First used for Norse invaders, this name, along with the similar Lachlan, is an attractive, worldly, and unusual choice — despite connections to the Nevada gambling resort. 

Laughlin

Liam is the top boys' name in the US, holding the Number 1 spot for the past seven years and also ranking as one of the most popular boys' names around the western world.
 Liam originated as a short form of Uilliam, the Irish variation of William. William is an English name from Germanic roots that was brought to Ireland when the British fled England following the Norman Conquest. The Irish began using English names, including William, which led to the development of Uilliam and its short form, Liam.
 Internationally, Liam is enjoying great popularity not only in the U.S. and its native Ireland, but in countries as diverse as Italy and Israel, Chile and Croatia. If you're looking for a boys' name that will easily translate across many languages and cultures, you can't do better than Liam.
 Irish-born actor Liam Neeson was instrumental in driving Liam up the charts, as was former Oasis member Liam (born William) Gallagher, and, more recently, One Direction member Liam Payne. Celebrities who have chosen Liam for their sons include Tori Spelling, Calista Flockhart, Rod Stewart, Kevin Costner and Craig Ferguson.
 Jaunty and richly textured, Liam holds solidly to the title of most popular boys' name starting with the letter L.

Liam

This spelling, which came to the attention of readers of the best-selling Angela's Ashes as the name of author Frank McCourt's father and brother, the latter of whom wrote a bestseller of his own, lends the biblical name a more expansive, almost boisterous image. Malachy is one of the <a href="https://nameberry.com/baby-names/168/irish-names">Irish baby names</a> that manages to strike the golden mean between familiarity and distinctiveness.

Malachy is also the anglicized version of Melaghlin, one of St. Patrick's first companions. It was borne by the High King Malachy, who defeated the Vikings at the Battle of Tara in 980. St. Malachy was a reformer who reorganized the church in Ireland after the Viking raids.

Another origin, via a somewhat circuitous route, is from the surname Mac Seachnaill, "son of Seachnall", the Irish form of Secundus.

Irish actor Cillian Murphy has a son named Malachy.

Malachy

An X-ending surname less common than the Jolie-Pitt-inspired Maddox. Grandparents might still associate it with the old TV crime show.

Mannix

This is an old Irish name  associated with such heroes as the seventeenth century chieftain, scholar and poet Manus O'Donnell. In this country, though, parents would not find Manus as pleasing or impressive as Magnus.


Manus

This jaunty Celtic surname -- the most common family name in both Ireland and the US -- is totally viable as a first. The arguably most famous Murphy is TV's Murphy Brown, and indeed the name is twice as common for baby girls as for baby boys today. But still, it's solidly gender neutral and works equally well for all sexes. 
 There have been countless notable surnamed Murphys, including the currently prominent Eddie and Cillian. Murphy was the eponymous protagonist of Samuel Beckett's first published novel.
 One possible negative: the association with Murphy's Law--if anything can go wrong, it will.

Murphy

Possible Gaelic alternative to Kevin and Devon. 

Nevin

For a name related to a Scottish town, a patterned Indian fabric, and a country singer named Brad, Paisley has seen remarkable success. After appearing, seemingly out of nowhere, it is now an American favorite. 
Deriving from a Scottish surname and town near Glasglow, Paisley means “church” or “cemetery.” It has been given to a tiny handful of girls each year since the 1960s, but it wasn’t until the late 2000s that it had any significant usage. 
 
Then, between 2010 and 2015, the number of girls named Paisley quadrupled, and it entered the US Top 50. 
 
So what did make Paisley so popular? Perhaps parents drew inspiration from the American country singer, Brad Paisley, who’s dueted with Dolly. Maybe the 2009 appearance of ‘Peppermint Paisley’ on the controversial TV show “Toddlers and Tiaras” turned some heads?
 
Or perhaps it simply emerged as a fresh spin on both Ashley and Paige, the once popular choices that were falling rapidly out of style?
 
However it made its way to the charts, Paisley remains in the US Top 100 and is given to over 4000 girls each year. Athlete Jennie Finch, The Guns ‘n’ Roses musician Richard Fortus, and the actress Gabrielle Anwar are among those who have chosen Paisley for their daughters. 
 
Nameberry users tend not to share this love of Paisley and it ranks outside the <a href=“https://nameberry.com/popular-names/nameberry/girls/allNameberry Top 1000”> Nameberry Top 1000.</a> For more ‘Berry-style’ choices, you could try Maisie, Daisy, Astrid, Romy, Blair or Marlowe.

Paisley

Peyton is a unisex surname that rose to fame in the 90s, with parents drawing inspiration from football star, Peyton Manning, and, oddly enough, from "Peyton Flanders", the villainess of the 1992 film, The Hand That Rocks The Cradle. Combining gentle sounds with contemporary style and the naughtiness of Peyton Place, the name remains a popular choice in the US today. 
 Derived from an English place name, Peyton could mean "Pæga's town" or "fighting man's estate", though other sources associate it with Patton and Patrick, giving it the meaning "nobleman's town". In tune with Avery, Paisley, and Harper - and an updated honor for Grandpa Patrick or Aunt Patricia - Peyton is in the US Top 200 and given to nearly 2000 girls every year.
 
Obscure until the 90s, solidly unisex in the early 2000s, a feminine-leaning, Top 100 choice in the 2010s, and now seemingly in decline, Peyton has had a turbulent time in the charts over the last three decades. 
 Whether it continues to fall or rise back up remains to be seen, but for now, it still feels like a familiar option, with namesakes ranging from the literary Peyton Loftis to the actress Peyton Roi List.

Peyton

Ronan is the compelling legendary name of twelve Irish and Scottish saints that is now drawing some deserved attention; this cousin of the ascending Roman and Rowan was chosen by actor Daniel Day-Lewis and his writer-director wife Rebecca Miller in 1998, and more recently by actress Catherine Bell.
 Ronan is a Harry Potter name—that of a centaur who lives in the Forbidden Forest. Ronan Keating is an Irish singer, Ronan Farrow is a TV personality and Hollywood scion, and its presence as a surname is represented by young actress Saoirse Ronan.

Ronan

Parents who have tired of Sean are now contemplating Seamus, the Irish form of James, which has a lot more substance and verve.
 One of the name's most famous bearers is the 1995 Nobel Prize-winning Irish poet Seamus Heaney. Seamus is also a Harry Potter name—Seamus Finnigan is a half-blood wizard friend of Harry's.
 At a time when the police force was predominantly Irish, "shamus" became a slang term for a detective.

Seamus

Sullivan is a jaunty Celtic three-syllable name, with a real twinkle in its eye. It was immortalized in the 1930s classic film Sullivan's Travels and was chosen for one of Patrick Dempsey's twin boys. Nickname Sully is equally jaunty.
 The third most common surname in Ireland, Sullivan's heritage dates back to the third century. Countless distinguished surnamed Sullivans include Sir Arthur, half of composing team Gilbert & Sullivan, Helen Keller's teacher Annie, Chicago architect Louis, early boxer John L. and dour columnist/TV emcee Ed.
 Other celebs with boys named Sullivan: singer Tom Waits and actor James Marsters. Heroic pilot Chesley Sullenberger is known as Sully, and a featured character in Pixar's Monsters, Inc. and Monsters University was Sullivan.

Sullivan

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. 
 Tiernan was a popular name in early and medieval Ireland and was borne by several kings and saints. It is currently high on the list in Northern Ireland.

Tiernan

c8face007's list "Baby Mahoney-Meyers" of 27 great name ideas: Collin - Tiernan!