Irish Name Order
Ord Ainm na Gaeilge
In Irish, the personal name precedes the surname (given name first), matching the English convention but diverging in gendered and grammatical treatment of the surname element.
Irish personal names follow the same given name + surname order as English, so Seán Ó Briain places the given name Seán before the surname Ó Briain. This contrasts with East Asian naming traditions where the family name comes first. However, the Irish naming system diverges from English in several important structural ways rooted in Irish-language grammar: the surname element changes its prefix according to gender and marital status, and the stem of the surname undergoes initial consonant mutation (lenition or eclipsis) in certain grammatical contexts.
Formal vs. Informal Address
In Irish, a person may be addressed by given name alone in informal contexts or by full name in formal ones. In traditional Gaelic society, an individual's full identity was often expressed through an extended patronymic chain: Seán mac Aodha mhic Sheáin (John son of Hugh son of John), which could trace multiple generations. This extended form is no longer used in daily life but appears in literary and historical texts. Modern Irish official usage employs the two-element given name + surname format for all practical purposes.
Bilingual Name Registration
Since the Civil Registration Act 2004, parents in Ireland can register a child's birth with an Irish-language name, an English-language name, or both. When both are registered, the Irish form appears first on the birth certificate. In practice, many families register only one form. Irish language policy promotes consistent use of the Irish-language form in state documents, particularly for residents of Gaeltacht areas, where both the given name order and the gendered surname system are applied according to the rules of the Caighdeán Oifigiúil (Official Standard).