Seán

Cillian

Old Irish · “Probably derived from the Old Irish "cell" meaning "church" combined with a diminutive suffix, giving the sense of "associated with the church" or "little church". The name was borne by the 7th-century Irish saint Killian of Würzburg, who evangelised in Franconia and was martyred there, spreading Irish Christianity across continental Europe.”

Declan

Old Irish · “Possibly derived from the Old Irish "Deaglán" or "Diaglán", with the most accepted interpretation being "full of goodness" or "man of prayer", though an alternate reading suggests "full of God" from "Dia" (God). Saint Declan of Ardmore was one of the earliest Christian missionaries in Ireland, predating Saint Patrick, and his name has been honoured in the Munster province for over fifteen centuries.”

Conor

Irish · “Anglicised form of the Irish "Conchobar" or "Conchobhar", derived from "con" (dog or wolf, used as an honorific for a great warrior) and "cobhar" (desiring or loving) — together possibly meaning "lover of hounds" or "wolf-lover". Conchobar mac Nessa was the king of Ulster in the Ulster Cycle of Irish mythology, the lord who ruled over the great warriors including Cúchulainn.”

Padraig

Irish · “The Irish form of Patrick, derived from the Latin "Patricius" meaning "nobleman" or "of noble birth", from "pater" (father). Saint Patrick (c. 385–461 AD), the patron saint of Ireland, was a Romano-British missionary who became the most celebrated figure in Irish Christianity. The Irish form Pádraig has been used in Ireland continuously since the early medieval period.”

Seamus

Irish · “The Irish form of James, which derives from the Late Latin "Jacomus", a variant of "Jacobus", from the Hebrew "Ya'aqov" (Jacob) meaning "supplanter" or "he who follows at the heel". Séamus has been used in Ireland since the Norman introduction of the name James, and it has become one of the most recognisably Irish masculine names internationally, associated with Irish poetry, politics, and cultural identity.”

Máire

“The Irish form of Mary, from the Latin "Maria" and Hebrew "Miryam", of debated meaning — possibly "sea of bitterness", "rebelliousness", or "their beloved". Máire is distinct from the English Mary in its Irish Gaelic form and was deliberately avoided as a given name in early Christian Ireland out of reverence for the Virgin Mary, which paradoxically led to it becoming one of the most common Irish women's names once that tradition relaxed in the post-medieval period.”

Roisin

“Derived from the Irish word "rós" meaning "rose" combined with the diminutive suffix "-ín", giving the full meaning "little rose". The name carries deep cultural significance in Irish tradition through the poem "Róisín Dubh" (Dark Little Rose), a 16th-century allegorical poem in which Ireland is personified as a dark-haired girl — a coded political metaphor that persisted through centuries of occupation.”

Oonagh

“Possibly an Irish form connected to "Una" or "Oonagh", from Old Irish "uan" meaning "lamb" or possibly from a root meaning "unity" or "one". In Irish mythology and folklore, Áine/Oonagh appears as a fairy queen — Oonagh was the queen of the fairies in many folk traditions, the wife of Fionnbarra, king of the Irish fairies, renowned for her golden hair that reached the ground.”

Seán

“The Irish form of John, introduced from the Norman French "Jean" (itself from Latin Iohannes and Hebrew Yohanan meaning "God is gracious") following the Norman invasion of Ireland in the twelfth century. Seán quickly displaced the older native form "Eoin" as the most common Irish masculine name and has remained so, producing some of the most celebrated names in Irish cultural history — from Seán O'Casey to Seán Lemass.”

Brennan

“An Anglicised form of the Irish surname Ó Braonáin, meaning "descendant of Braonán", where Braonán is a diminutive of "braon" meaning "moisture", "drop", or "sorrow". The name is associated with Saint Brendan the Navigator (Naomh Bréanainn), the 6th-century Irish monk who, according to legend, sailed across the Atlantic to discover a western paradise. When used as a first name, it carries both the sorrow-drop etymology and the adventuring saint.”

Aiden

“An anglicised spelling of Aodhán, the diminutive of the Old Irish Aodh, meaning "fire" — Aodh was the Celtic god of sun and fire. The name was borne by several early Irish saints, most notably Saint Aidan of Lindisfarne (c. 590–651), who helped Christianise northern England. Aiden is the most common American English spelling; Aidan is the Irish and British form.”