| Irish Name | Pronunciation | English equivalent | Meaning or Origin |
| Éber/Éibhear | eev-ur | Hector/Ivor | Originally popular in legends, and throughout the medieval period, it became a name localised to Derry until the late 19th century. |
| Eiltíne | Elt-in | xxxx | In Irish means nimble person. St Eiltíne is patron saint of Kinsale. |
| Émann/Éamonn | Aym-on | Edmond, Edmund | An Irish rendition of the Anglo-Norman name, Edmond, it means rich protector. Ireland's first Taoiseach (Prime Minister) was Eamon de Valera. |
| Emmett | Eh-met | xxxx | Although it didn't start out as a first name, it has become popular as such because it honours Robert Emmett, one of Ireland's great Irish rebel heroes. |
| Éanne | E-na | Enda | Means free as a bird. Many ancient heroes bore this name including a legendary king of Munster. Popular among the Kavanaghs and Kinsella families. The anglicised version is unisex. |
| Eoghan | Ohn/Oh-win | Owen | One of the most popular names of early Ireland. In south of Ireland, the anglicisation tends to be Eugene. |
| Fachtna | Fork-nah | xxxx | A very popular name in early Ireland, despite meaning malicious or hostile.It can also be a female name. |
| Fearghal | Fur-gull | Fergal | Means brave man in Irish and once extremely popular. Has regained some popularity recently. |
| Fiachra | Fee-krah | xxxx | Possibly means battle king. One of the most common male Irish names in the Middle Ages. In France, St Fiachra is the patron saint of taxi drivers and travellers. |
| Fíngin | Fin-in | Florence | Means wine-birth and was the name of an early king of Munster. It remains a relatively common name in that province. |
| Finnbarr | Fun-var | Barry | Means fair-haired one. A popular name in County Cork (Saint Finbarr is the patron saint of Cork City. |
| Fionn/Finn | Fee-yun | Finn | In Irish, means fair or white-haired. The tale of Fionn McCumhail, aka Finn McCool, is one of the best known Irish legends. |
| Gallchobar | Gal-chur | xxxx | Uncommon old name from which the surname Gallagher derives. |
| Gillucan | Gul-agen | Gillian | Means little lad. Uncommon old name from which the surname Gilligan derives. |
| Iarlaith | Eer-la | Jarlath | Name of the patron saint of the diocese of Tuam, co. Galway, where the name remains popular. |
| Illann | Ul-ann | xxxx | The name of an early king of Leinster and many warriors of the Fianna. Relatively common name in the late middle ages. |
| Irél | Ir-ee-al | xxxx | In traditional tales, Irél is the son of Conall Cearnach, a great warrior from Ulster. |
| Lachtna | Lokt-na | Lucius | Means of the colour of milk. The name is found mainly in Munster and was borne by many Munster high nobles including the brother of Brian Boru. |
| Laígsech | Leesh-ach | Lysagh/Lewis | Means man of Laois. |
| Lennán | Lan-aan | Lennan | Means sweetheart or paramour. Name of king of western co. Clare in early 900s. |
| Lochlainn | Luk-lin | Lachlan | Probably means Viking. Popoular name of the O Neills in Ulster and O Hanleys in Connaught. |
| Lorccán | Lurk-an | Lorcan | Means silent or fierce. One of the most common male Irish names in the medieval period, and borne by the grandfather of Brian Boru and several kings of Munster and Leinster. |
| Lugan | Lu-ane | xxxx | Comes from Lug, a Celtic god and master of all the arts, meaning radiant, brilliant. |
| Lughaidh/Lúí | Lu-ee | Lewis | Very popular name in early Ireland, and in legend. Also many saints. Derived from the name Lug, a Celtic god. |
| Máenach | Men-ach | xxxx | Quiet one. A common name throughout old Ireland. |
| Maine | Man-ee | Many | Extremely popular early Irish name, in both legend and history. |
| Marcán | Mork-an | xxxx | Popular southern name in old Ireland. Marcán mac Cennetig was Brian Boru's brother. |
| Muirchertach | Mir-art-ach | Murtaugh/Mortimer | Meaning skilled mariner, One of the most popular male Irish names in early and medieval Ireland, and even until the 19th century among some northern families. Muirchertach mac Erca is a legendary high king but the name also belonged to historical kings. |