From Ó Mainnín, meaning debated — a County Galway name, most concentrated around Kilconnell.
The Mannion certificate.
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Gaelic Origin · Root meaning uncertain
Mannion comes from Ó Mainnín, a name whose root is not confidently traced despite real attempts at it. The family were most closely associated with the district around Kilconnell in County Galway, where a specific, well-documented place has carried this name for longer than any tidy etymology has existed for it.
Not every name needs a tidy etymology to carry a real, specific place with it — Kilconnell has known this family by this name for a very long time.
Irish form: Ó Mainnín
