From Mag Fhionnbhairr, built on fionnbharr, ‘fair head’ — first found in County Longford, in the old territory of Annaly.
The Gaynor certificate.
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Gaelic Origin · County Longford
Gaynor anglicises Mag Fhionnbhairr, built on fionnbharr, ‘fair head’ — most likely an early physical byname. The surname was first found in County Longford, in the Irish Midlands, in the territory traditionally known as Annaly or Teffia, in the northwest of Leinster.
A name that started as a description of one fair-headed man and settled, centuries on, into a single Midlands county.
Irish form: Mag Fhionnbhairr
