33+ Irish Names Starting with O

Editor-in-ChiefUpdated Dec 5, 202533 Names

Irish O names carry the weight of ancient clan history. These names often begin with O meaning grandson of, connecting to family lineage. O names feel distinguished and deeply Irish.

Understand that many O names are traditionally surnames used as first names. This is a proud Irish naming custom. accept the tradition if it connects with your family.

Browse 33 Irish names starting with O in this guide. Each name includes its clan history and meaning. Choose one that honors your heritage with pride.

Popular Names

Below is a visual overview of the most popular irish names starting with o for boys and girls. Use this snapshot to compare top picks at a glance.

Top Irish Names Starting with O ranked by popularity

Irish Names Starting with O for Girls

Origin:Irish
Meaning:"Lamb"
Description:Anglicized form of Irish Úna, often interpreted as lamb, with literary visibility contributing to international adoption.

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Origin:Irish
Meaning:"Golden Princess"
Description:From Irish Gaelic forms meaning golden princess, long used in Ireland and increasingly adopted in broader English-speaking settings.

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Origin:Modern English, Irish
Meaning:"Little Deer"
Description:Stylized form of Oisin, an Irish name meaning little deer, respelled to approximate English phonetics.

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Origin:Irish, Latin
Meaning:"Honor"
Description:A form linked to honor-based naming, sometimes treated as a variant of Honora within Irish and Latin-influenced traditions.

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Origin:Irish
Meaning:"One; Unique"
Description:Anglicized form of Úna, commonly interpreted as one or unique, with strong association to Irish Gaelic naming tradition.

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Origin:Irish, Germanic
Meaning:"Deer Friend"
Description:Often linked to Irish elements meaning deer and friend, it gained wider circulation through literature and Scandinavian influence.

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Origin:Irish, English
Meaning:"Golden Princess"
Description:Orlena is often treated as an elaboration of Irish Orla forms, commonly glossed as referring to a golden princess.

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Origin:English, Irish
Meaning:"Spear Ruler"
Description:Nickname-like form connected to names such as Orville or Irish-derived forms, it functions as a familiar diminutive in usage.

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Origin:Irish
Meaning:"Descendant of Niall"
Description:Oneal reflects an Anglicized form of an Irish surname lineage, historically associated with the Uí Néill dynastic tradition.

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Origin:Irish, Scottish Gaelic
Meaning:"Pale or Golden"
Description:Orra is a Gaelic-associated form often linked to descriptive color epithets and used as a concise given name.

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Origin:Irish, English
Meaning:"Descendant of Niall"
Description:Onell is an English rendering related to O’Neill traditions, historically interpreted as descendant of Niall in Irish contexts.

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Origin:Irish
Meaning:"Descendant of Séaghdha"
Description:Oshea derives from Irish Ó Séaghdha, used as a surname and given name with lineage-based meaning.

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Irish Names Starting with O for Boys

Origin:Irish, Germanic
Meaning:"Deer Friend"
Description:Often linked to Irish elements meaning deer and friend, it gained wider circulation through literature and Scandinavian influence.

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Origin:Irish, Hebrew
Meaning:"Light"
Description:Can reflect Irish Odhrán-related forms or Hebrew Or meaning light, so etymology depends on the naming tradition.

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Origin:Irish, English
Meaning:"White or Pale"
Description:Commonly linked to Irish Gaelic roots, it is interpreted as white or pale and appears as a given name in English usage.

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Origin:Irish
Meaning:"Descendant of Séaghdha"
Description:Oshea derives from Irish Ó Séaghdha, used as a surname and given name with lineage-based meaning.

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Origin:Irish, English
Meaning:"Descendant of Riordan"
Description:Often treated as a surname-derived given name, plausibly linked to Irish O Riordan forms and lineage meanings.

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Origin:Irish
Meaning:"Little Deer"
Description:An Irish Gaelic name prominent in Fenian legend, derived from a term meaning little deer or fawn.

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Origin:Irish
Meaning:"Descendant of Odhlann"
Description:Olan is often linked to Irish surname forms, with meaning tied to descent from a personal name rather than a transparent lexical gloss.

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Origin:Irish, Hebrew
Meaning:"Light; Pine"
Description:Oran occurs as an Anglicization of Irish Odhrán and also resembles Hebrew-derived forms, leading to multiple competing interpretations.

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Origin:Irish
Meaning:"Descendant of Niall"
Description:Oneal reflects an Anglicized form of an Irish surname lineage, historically associated with the Uí Néill dynastic tradition.

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Origin:Irish
Meaning:"Descendant of Niall"
Description:Derived from an Irish patronymic surname, it appears as a given name especially in diaspora contexts.

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Origin:English, Irish
Meaning:"Descendant of O Shea"
Description:A given name adapted from the Irish surname O Shea tradition, functioning as a patronymic-style modern personal name.

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Origin:Modern, Irish
Meaning:"God"
Description:A modern name possibly influenced by O Shea surname forms, though usage varies and a fixed lexical meaning is not consistently established.

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Origin:English, Irish
Meaning:"Spear Ruler"
Description:Nickname-like form connected to names such as Orville or Irish-derived forms, it functions as a familiar diminutive in usage.

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Origin:Irish, Norman
Meaning:"Bear Mound"
Description:Ormond reflects Irish regional history and may relate to older elements interpreted as bear and mound.

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Origin:Irish, English
Meaning:"Descendant of Brian"
Description:Obrian reflects an English rendering of Irish patronymic naming tied to the Brian lineage, often treated as a given name.

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Origin:Irish
Meaning:"Descendant of Brian"
Description:Obryan represents a modern spelling variant of the Irish surname OBrien indicating descent from the personal name Brian.

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Origin:Irish
Meaning:"Golden Princess"
Description:From Irish Gaelic forms meaning golden princess, long used in Ireland and increasingly adopted in broader English-speaking settings.

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Origin:Irish, English
Meaning:"Deer Lover"
Description:Osker is a variant of Oscar, associated with Gaelic tradition and often glossed with deer-related etymological interpretations.

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Origin:Irish
Meaning:"Descendant of Brian"
Description:Obrien is an Irish surname form used as a given name, indicating descent from Brian within Gaelic patronymic tradition.

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Origin:Irish
Meaning:"Descendant of Niall"
Description:Surname-derived given name from Irish Ó Néill, meaning descendant of Niall and associated with prominent Gaelic lineages.

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Origin:Irish, Modern
Meaning:"God Is Gracious"
Description:Often interpreted as a variant of Oisin or Shane forms, with meanings influenced by Irish and English usage.

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Why Choose Irish Names Starting with O?

Choosing from irish names starting with o gives your child a story-rich start. These names often carry a clear emotional meaning, making your final choice feel both personal and intentional.

Written by

Baby Name Expert & Lead Editor

Editor-in-Chief with 15+ years in baby naming and linguistics. Columbia University M.A. in Linguistics.

Classic NamesName EtymologyCultural Naming Traditions

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