- Ailbe (Alby) - After an Irish saint
- Aichlinn (Aik-lin) - A derivative of Echlin
- Ailill (Aye-lil) - After Ailill Molt, and early Irish king. Meaning sprite
- Ailin (Aye-lin) - Early Irish name. Meaning noble
- Aindreas (Andre-as) - After St. Andrew, the Patron Saint of Scotland. Meaning manly
- Anmire (Ayen-mire) - After St. Ainmire of County DONEGAL. Meaning great lord
- Alphonsus (Alfonsus) - After St. Alphonsus Liguori. Meaning noble ready. Also: Alf, Phonsie (Fon-si)
- Ambros (Ambrose) - Meaning immortal
- Anluan (Anloo-an) - Meaning great champion
- Anrai (Awn-ree) - Irish form of Henry, used after Henry Joy McCracken, the Ulster Rebel. Also: Annraoi
- Aodh (Ee) - An Irish name, Anglicised as Hugh. Also: Aodhaigh (Ay-ee)
- Aodhan (Aye-den) - After St. Aiden. Meaning little fire
- Aodhfionn (Ee-fin) - An early Irish name. Meaning white fire
- Aodhgan (Ee-gan) - An Irish name. Meaning little fire
- Aonghus (Ain-gus) - After St. Aengus the Culdee. Meaning one vigour
- Aralt (Ar-alt) - The Irish form of Harold. Meaning army power
- Ardal - An old Irish name meaning high valour
- Aron (Ar-on) - Meaning high mountain
- Banbhan (Ban-van) - An early Irish name meaning little piglet.
- Baothan (Baythan) - An early Irish name meaning little foolish one.
- Beacan (Bee-can) - After St. Becan. Meaning little one.
- Bearach (Barrah) - After St. Barry. Meaning spearlike.
- Blathmac (Blah-mac) - After a king of Tara. Meaning flower son.
- Bran - Name of a celtic Deity. Meaning raven. Also: Brandan.
- Breasal (Bree-sal) - After St. Brazil. Meaning strife. Also: Bresal.
- Brendan - After St. Brendan. Meaning prince.
- Brian (Bree-an) - After King Brian Boru.
- Cadhla (Kad-la) - After an Archbishop of Tuam, Co Galway. Meaning handsome.
- Caibre (Ka-bra) - Cairbe defeated Fionna at the Battle of Gabhra. Meaning: 'strong man'.
- Caomhan (Kee-van) - After St. Kevin. Meaning: little handsome one.
- Carthach (Kar-thage) - After St. Carthage. Meaning: loving.
- Catabhar (Katabar) - A DONEGAL name. Meaning helmet.
- Cathaeoir (Kahir) - An Irish name meaning warrior. Also: Cahir.
- Cathal (Cah-hal) - Irish version of Charles. Cathal was a might warrior.
- Chuchulainn (Koo-cullen) - The nickname name of the greatest hero of Irish mythology (his real name was Setana). Meaning hound of Culann.
- Cian (Kee-an) - An old Irish name meaning ancient.
- Ciaran (Keer-an) - After St. Ciaran. Also: Kieran.
- Cillian (Killeean) - After an Irish missionary who was martyred. Also: Killian.
- Colm - After St. Colmcille. Meaning dove. Also: Columba (Kolumba), Colum (Kolum).
- Colman (Kol-man) - Irish form of Columbanus. Meaning dovelet.
- Coman (Ko-man) - Meaning little wry one.
- Comhghall (Koh-gal) - After St. Cole. Meaning co-pledge.
- Conal (Konal) -
- Conan (Koe-nan) - After St. Conan. Meaning small hound. Also: Conant.
- Conn - After a legendary Irish monarch, Conn of the Hundred Battles. Meaning ‘high’.
- Conor - An Irish name. Meaning desire or ‘hound lover’. Also: Connor.
- Cormac (Kor-mac) - After St. Cormac. Meaning: charioteet.
- Criomhthann (Kree-van) - An Irish name. Meaning fox. This is the baptismal name of St. Colmcille.
- Crogher (Kro-her) -
- Criostoir (Kreest-chor) - The Irish form of Christopher. Meaning christ-bearing. Also: Christy.
- Cronan (Kro-nan) - After St. Cronan. Meaning little dark brown one.
- Cumhai (koo-ie) - Anglisised as Quintin. Meaning hound of the plain.
- Cumhea (Kovay) - An Irish name. Meaning hound of Meath.
- Daghda (Dag-da) - After an Irish deity. Meaning the good god.
- Daithi (Da-hey) - One of the kings of Tara. Meaning speed agility. Also: Nathy, Daivi.
- Dallan - After St. Dallan. Also: Dall.
- Daman (Dayman) - The Irish form of Damien. Meaning to tame.
- Daineal (Doh-nal) - The Irish form of Daniel. Meaning God is my judge. Also: Dainail
- Dara - An old Irish name. Darragh is the Anglicised form. Meaning oak.
- Darren - An Irish name meaning little great one.
- De (Jay) - After St. De.
- Deaglan (Dek-lan) - After St. Declan. Also: Declan.
- Diarmuid (Djeermoodge) - After St. Diarmuid. Meaning free man or envy free. Also: Dermot (Der-mot), Dermod.
- Dichu (Dee-shoo) - After St. Dichu, the first Irish convert to Christianity made by St. Patrick. Meaning great hound.
- Doiminic (Dom-nik) - After St. Dominic de Guzman. Also: - Damhlaic (Dav-lik), Damhnaic (Dav-nik).
- Donal (Doh-nal) - From the English Daniel or Donald. Meaning 'mighty'. Also: Domhnall (Doh-nal).
- Donnahadh (Dun-agh-ha) - After the High King of Donagh, son of Brian Boru. Meaning brown warrior.
- Dorchaidhe (Dor-k-ha-dj) - An Irish name. Anglicised to D’Orsay.
- Dughall (Doo-gal) - A Gaelic name. Meaning dark foreigner. Also: Dougal.
- Dughlas (Doo-glas) - A Gaelic name. Meaning black blue. Also: Douglas (Dug-las)
- Dualtach (Dul-tack) - An Irish name Anglicised to Dudley. Meaning 'black-jointed’.
- Dubhdara (Doov-dara) - An early Irish name. Meaning black man of the oak.
- Eamon (Aymon) - Irish form of Edmund. Meaning blessed protection. Also: Eamonn Aymon)
- Earc (Erk) - An old Irish name. Meaning red or speckled.
- Eachtar (eck-tar) - Irish form of Hector.
- Earnan (Ear-nan) - Anglicised to Earnest. Meaning little-experienced one.
- Eibhear (ee-v-har) - Eibhear was the son of the ledgendary leader, Milesius. Anglicised as Ivor. Meaning companion.
- Eireamhon (Er-von) - An Irish name. A son of Milesius.
- Elga (El-ga) - Another name for Ireland was Inis Elga – the Noble Isle. Meaning: 'noble'.
- Emmet (Em-et) - The surname of the renowned Irish rebel, Robert Emmet and often used as a Christian name in Ireland.
- Eochaidh (Ock-h-ay) - An old Irish name.
- Eoghan (Owe-en) - An Irish form of John. Meaning well born. Also: Owen.
- Eoin (Ee-an) - A derivative of John.
- Fachtna (Fak-na) - After an early Irish saint.
- Feardorcha (Far-dor-a-ka) - Old Irish name. Anglicised as Frederick or Ferdinand. Meaning:
- Fearghall (Fer-gal) - After St. Fergal. Meaning man of strength.
- Fearghus (Fer-gus) - Of celtic origin. Meaning ‘super choice’ or man of vigour. Also: Fearghais, Fergus.
- Fechin (Fee-k-hin) - After and Irish saint. Meaning little raven. Also: Feichin.
- Felim (Fee-lim) - After a king of Connacht. Meaning little raven. Anglicised to Felix. Also: Feilim, Phelim.
- Fiachra (Fee-kra) - After St. Fiachra. Meaning raven.
- Finin (Fin-een) - Meaning fair offspring.
- Finnian (Fin-ee-an) - After St. Finian.
- Fionbharr (Fin-bar) - After St. Finbar. Meaning fair head.
- Fionnlugh (Fin-lug) - After an early Irish saint. Meaning fair winning.
- Fionn (Fin) - After the great hero of Irish mythology, Finn MacCool. Also: Finn, Fynn.
- Flann - An early Irish name. Meaning blood-red.
- Fursa (Fur-say) - After St. Fursey.
- Gael (Gayl) - The medieval hero after whom Ireland was named.
- Gearoid (Garr-oij) - The Irish form of Garrett. Also: Gairiad (Gar-oij), Garreth, Gary.
- Gearard (Ger-hard) - After St. Gerard Majella. Meaning spear hard.
- Greagoir (Greg-or) - Irish form of Gregory. Meaning watchful one.
- Gruagach (Grua-gah) - An Irish name. Meaning hairy one.
- Irial (Ir-e-al) - An old Irish name.
- Iarghlaith (Eer-lath) - After St. Jarlath. Also: Jarlath.
- Iona - (eye-ona) - Irish form of Johan. Meaning: 'dove'.
- Iosog (Ee-sog) - Irish form of Issac. Meaning he may laugh.
- Iustas (Ew-stace) - Irish form of Eustace. Meaning fruitful.
- Kellagh (Kella) - After St. Celsus.
- Kerill (Kiril) - Irish form of Cyril. Meaning lordly. Also: Coireall (Kiril).
- Kyras (Ki-ras) - An old Irish name.
- Labhras (Lav-ras) - After St. Lorcan. Irish form of Laurence.
- Laoghaire (Lee-ra) - A king of Tara. Meaning calf-herder.
- Leon(Lee-on) - Irish name meaning lion.
- Liam (Lee-am) - The short form of Uilliam which is the Irish form of William.
- Lochlainn (Lock-lin) - The name of a land in Irish legend. Meaning heroic. Also: Lochlin
- Lorcan (Lorkan) - The Irish form of Lawrence. Meaning fierce.
- Lucan (Loo-kan) - An Irish form of the Latin, Lucius. Meaning light.
- Lucas (Loos) - After St. Luke.
- Lugh (Loo-h) - The name of an early Irish hero.
- Macanisius (Mac-an-is-us) - After St. Macanisus, and early Irish bishop.
- Mairtin (Mar-cheen) - After St. Martin. From Mars, the God of war.
- Maitiu (Mat-tuw) - After one of the apolstles. Derived from Matthew.
- Malachy (Mal-ak-ay) - After St. Malachy. Meaning my messenger.
- Manus (Man-us) - Popular name in DONEGAL for many years. Meaning great.
- Maolcholm (Mal-come) - Meaning servant of St. Columba.
- Micheal (Mee-haal) - After St. Michael. Irish form of Michael.
- Niall (Ny-al) - Irish form of Neil.
- Padraig (Paudrig) - After St. Patrick. Irish form of Patrick. Also: Padraic, Padhraig, Paddy
- Peadar (Padder) - The Irish form of Peter. Meaning rock
- Ronan (Row-nan) - From the Irish word ron , meaning ‘seal’
- Seamus (Shay-mus) - After St. James. The Irish form of James. Also: Seamas, Seamy
- Sean (Shawn) - After John the Baptist. Irish form of John. Also: Seon
- Siseal (Ses-il) - After St. Cecil. Meaning little blind one. Also: Cecil
T- Tadgh (Tah-g) - Irish form of Timothy. Meaning poet
- Tomas (Tom-ass) - Irish form of Thomas. Meaning twin