For background on how the map was made (and its flaws), see the relevant blog entry.
|Neale||fairly rare: Belfast area, Midlands etc. Ir. Mac Néill. According to Reaney, this name Niall, started in Ireland and did a tour of Europe before becoming a regular English name. It is also Scottish in the form Mac Neill.|
|Neill||Very numerous: mainly Ulster, also Carlow etc. Ir. Ó Néill. From first name Niall which enjoyed international popularity in mediaeval times. See O'Neill & Neal.|
|Niall||rare: Dublin. First name Niall when used as a surname would become Néill in Irish, usually prefixed by Mac or Ó. In English, the nominative form would be Neal.|
|Ó Néill||O'Neill: an-líonmhar gach aird, i gCúige Uladh ach go h-áirithe. Ceann de mhór-chlanna Gael. Bhí siad i gceannas ar Chineál Eoghain in Ultaibh agus bhí clanna eile i dTuathmhumhain, Ceatharlach agus Tiobraid Árann theas. Mhaígh na h-Ultaigh sinsearacht ó Niall Naoi-ghiallach agus ba mhór a dtionchur ar stair na tíre sa 16 & 17 céad. Roimh theacht Bhrian Bhóroimhe, bhí an chraobh ar a dtugtaí Niallaigh an Deiscirt ina n-Ard-Ríthe ar Éirinn. Bhí craobh eile in Aontroim ar a dtugtaí Clann Aodha Bhuidhe. Níl na h-údair ar aon aigne faoi bhrí an ainm Niall ach bhí sé faiseanta ar fud na h-Eorpa sa mheán-aois. SGG & IF.|
|O'Neill||Very numerous: all areas, especially Ulster. Ir. Ó Néill, from first name Niall, derivation uncertain, though Woulfe gives "champion". They were the leading sept of Cinéal Eoghain in Ulster. There were other septs in Thomond, S Leinster and the Déise (Waterford). IF & SGG.|
DEDs where O'Niell and a second surname are found together