Aodhán

Arcán

If you like the Irish surname feel, there are loads of more congenial options. 

Banning

This was a common name in early Ireland, borne by numerous saints, but pronunciation problems would make it prohibitive here. 

Bearchán

This more user-friendly Anglicized form of Beacan, could profit from its kinship with the popular Beckett--with which it could share the nickname Beck. Becan is an Irish saint's name, attached to the founder of a sixth century monastery.
 For ease of pronunciation, it can also be spelled Beccan.

Becan

An Irish surname name with a combination of boldness and élan. Some might connect it to the founder of the group T. Rex -- Marc Bolan. 

Bolan

Bold Irish surname, full of energy and cheer. 

Branagan

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.
 In "Shrek Forever After" Brogan was an ogre voiced by Jon Hamm. Supposedly, the character was almost called Gnimrahc--or Charming spelled backwards. Brogan is better.

Brogan

Interesting Irish diminutive of Bridget or Bríd.

Brídín

Beagán

The original Irish spelling of Caitlin, the name that launched a thousand spelling variations.

Caitlín

A Top 100 choice in Northern Ireland, Caolán shares many fashionable sounds with names like Cayden and Callan, but remains virtually unknown in the US.

Caolán

While the lin ending is more commonly found in girls' names, Carlin is an authentic Irish male choice and was used just about evenly for both sexes in the US last year.

Carlin

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.

Ciarán

Cillín

Caisleán

Ciseán

Colmán

Crosán

Crágán

Darren and wife Sharon shop for fifties memorabilia on eBay. The Connecticut place-name Darien might offer an update. 

Darren

This Irish saint's name makes an attractive alternative for Dylan or Donald. 

Donnan

Damhán

A pleasingly simple alternate spelling of Aidan - but likely to get confused with Eden. In Hebrew, it means "era", and it's a Top 100 name in Israel.

Edan

Egan's likeness to the word eager gives this Irish surname a ready-to-please, effervescent energy, and it would make an appropriate substitute for the overused Aidan.
 This popular Irish surname originated in County Tipperary.
 Egan O'Rahilly (born Aogan O Raithaille) was the outstanding poet of his age, specializing in the vision poem, or aisling, in which he told of prophesies that Ireland would triumph over her enemies. In folklore, this Egan is depicted as a wise trickster.

Egan

Feeny and its alternative spelling Feeney have several origins in Irish. They are anglicised forms of the surnames Ó Fiannaidhe (descendant of Fiannaidhe, meaning warrior), and Ó Fidhne (descendant of Fidhne, from the word for tree or wood). Feeny is also a place name in Northern Ireland, meaning "the woods. Although many Irish surnames are in style, like Keegan and Sullivan, this is one you've probably never met on a person before.

Feeny

Irish surname derived from the name Gairbhín, a diminutive of garbh, "rough". It's barely been used as a first name, but could be a similar-yet-different alternative to names like Nolan and Sullivan.

Garvan

Góislín

A little further down the road paved by Aidan and Logan. 

Hagan

A growing number of high-profile (and other) parents are choosing to honor their musical idols, such as Hendrix, Presley, Jagger, and now Lennon. Lennon first came to notice when Liam Gallagher and Patsy Kensit used it for their son in 1999, and singer-musician Adam Pascal followed their lead in two years later. Thanks in part to female singer and actress Lennon Stella, it's now more popular for girls than for boys.
 Lennon made it onto the popularity list in 2008. 
 In addition to its obvious Beatles connection, Lennon has a nice lemony feel.

Lennon

Lorcan is a name rich in Irish history as belonging to several kings, including the grandfather of the most famous high king of Ireland, Brian Boru. Lorcan O'Toole, known in English as Laurence O'Toole, is the patron saint of Dublin, so it's not too surprising that Irish-born actor Peter O'Toole named his son Lorcan.
 In the Harry Potter epic, Lorcan is the twin son of Luna Lovegood Scamander.
 Strong, easy to pronounce and spell, Lorcan is an Irish name that would stand out from the more common crop of Connors and Liams.

Lorcan

Lachín

Madden is an Irish surname relative of Madigan rising through the charts thanks to its trendy two-syllable, -en ending sound along with its appeal to Madden Football video game-playing dads.  John Madden is a former pro football player who went on to coach the Oakland Raiders and become a popular NFL commentator. Madden is also the surname of groovy Nicole Richie baby daddy Joel Madden.

Madden

A jovial and jaunty Irish name, the title of a long-gone TV crime drama, this would make an appealing choice. Slight downside: Maddy is already a mega-popular nickname for Madeline/Madelyn and Madison, so this Mad- name might not feel as distinctive as the stats would suggest.

Madigan

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

Mannix

Meidhbhín

Máirín

Neidín

Odhran, Anglicized as Oran, was the name of an ancient saint. Today, Odhran is among the Top 100 <a href="https://nameberry.com/list/328/irish-baby-names-for-boys">Irish names for boys</a> in Ireland.

Odhran

Oisin is one of the most popular <a href="https://nameberry.com/baby-names/168/irish-names">Irish baby names</a> in its native land, though largely unknown in the US. The original Oisin was the mythological son of Finn McCool and Sadb, the goddess who was changed into a deer. A legendary war hero and poet, Oisin had a name that is also reminiscent in sound of the ocean. Pronounced correctly, this name has an attractive sheen.
 Ossian is another version, reflected in the eighteenth century Ossianic poems of James Macpherson, which transformed him into a Scottish hero and also popularized the names Oscar, Fingal, Selma and Malvina.

Oisin

A calm and gentle multicultural choice. Oran is popular in Ireland, where its Gaelic form is Odhrán, meaning "little green one". In Scottish Gaelic, the name means "song", and in Hebrew, it's a combination of Or "light" + Ran "singing".

Oran

This Irish saint's name sounds like a lopped-off Lorna. 

Orna

Poitín

Páidín

Inextricably tied to the former president, Reagan is a handsome surname name with a cool, current sound. Gender-neutral nickname Ray/Rae is also very on-trend right now.

 Reagan has been more popular for girls than boys in the US since the 1970s, currently ranking just below the Top 100 for girls and just below the Top 1000 for boys. It is just starting to drop a little in popularity, but it's still one of the most familiar <a href="https://nameberry.com/unisex-names">unisex names</a> in the US.

Reagan

A spelling variant of presidential surname Regan that briefly entered the Top 1000 for boys in the 1960s, but hasn't rejoined the list since. Shakespeare also used the name for a daughter of King Lear, inspired by an ancient king of the Britons in accounts of the medieval scribe Geoffrey of Monmouth.

Regan

More authentic and original form of Ryan, but far less common of the two spellings.

Rian

Warm-hued spelling spin on Rowan that was chosen by Sharon Stone for one of her three young sons.

Roan

No, the pronunciation--ro-SHEEN--isn't immediately obvious to the non-Gaelic viewer, but the sound of this shiny Irish version of Rose is pretty enough to make it worth considering. Very popular in its native Ireland, it's one of many <a href="Irish girl names https://nameberry.com/list/753/best-irish-girl-names">Irish girl names</a> finding a wider audience. Earlier generations Anglicized at as Rosaleen, but we stay stick to the original.
 The name has been associated with a 16th-17th century poem called Roisin Dubh (Dark Little Rose), the eponymous heroine of which is usually regarded as a personification of Ireland.
 Singer Sinead O'Connor has a daughter named Róisin.

Roisin

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

With its gentle sounds and earthy vibes, the name Rowan feels like a fusion of different styles. A word name, a surname, and a gender-neutral name, Rowan is rustic but trendy, blending the vibes of both Owen and Oakley. 
Just as it’s hard to fit Rowan into one category, it’s equally difficult to identify one definitive root. It could be considered an Anglicized form of the Irish name Ruadhán, meaning “little redhead” and it was used as an English surname before it became a given name. 
Alternatively, it could be linked to the rowan tree, whose name derives from Old Norse and means “to redden.” In folklore and mythology, rowan trees are seen as a symbol of protection and of life, adding extra meaning to Rowan. 
 To complicate matters further, some scholars identify Rowan as a girls’ name, deriving from Rowena and Rhonwen, meaning “famous friend” or “white spear.” This gives it solid credentials as a unisex name and lends it a slightly more rugged vibe. 
What is certain, however, is that Rowan has quickly become a stylish choice, chosen for over 3000 boys every year. Once an obscure name in the US, it rapidly climbed the charts during the 2010s and has now entered the Top 100 Boy Names for the first time. 
Rowan is popular in the UK, Canada, and the Netherlands too, but even more so among Nameberry users, where it ranks in the <a href=“https://nameberry.com/popular-names/nameberry/boys/allNameberry Top 1000”> Nameberry Top 30.</a> 
The most prominent bearer of the name is probably Rowan Atkinson, the British comic actor of Blackadder and Mr Bean fame. Other namesakes include the former Archbishop of Canterbury, Rowan Douglas Williams, and the Australian swimmer, Rowan Crothers. Pokémon fans and Sarah J. Maas readers might recognize it too as the name of a character in both the game franchise and in the Throne of Glass series. 
Gentle but powerful, stylish but not oversaturated, Rowan may well continue to climb the charts, so if you love Rowan but want to stray from the trends, Ruan, Sylvan, Lorcan, Lennox, Wren and Sloan might inspire you.

Rowan

Ruadhán

Réiltín

The double 'e' gives this Celtic surname a genial sound. It derives from an old Irish name &mdash; Suibhne (SHEEV-ne) that was borne by several early saints and kings, including, unfortunately, one known as Mad Sweeney who spent his life living in trees and composing nature poetry. Another possible drawback is the association with Sweeney Todd, the bloodthirsty butcher of Sondheim stage-musical fame.
 But if you can put all that aside, Sweeney makes a cheery choice.

Sweeney

Seánín

Séamaisín

Teagan is a cousin of trendy names Reagan and Keagan now given to girls about six times as often as boys. As an Irish name, it's a diminutive of the original Tadhg. Teagan may also be a variation of the Welsh Tegan, a saint's name that means fair.

Teagan

Tomáisín

Ulick

Árasán

Éonan

vintageluvs's list "Diminuitive Irish Names" of 61 great name ideas: Aodhán - Éonan!