For background on how the map was made (and its flaws), see the relevant blog entry.
|Keon||rare: scattered. Ir. Mac Eoghain. More usually MacKeon, q.v.|
|Keown||fairly numerous: Fermanagh, Down etc. MacLysaght has given Ó Ceotháin in Fermanagh, but the general conclusion is that it is one of the many synonyms of the basic Mac Eoghain, which appears as Magone, MacCone, MacCune, MacEwen, MacGeown.|
|MacGeown||numerous: Armagh-Down-Tyrone-Antrim- Monaghan-Louth. Ir. Mag Eoghain. From first name Eoghan. See also Mac Keown.|
|MacKeon||numerous: all areas, especially Midlands & Connacht. Ir. Mac Eoghain, from old first name Eoghan (yew-born), or Mac Eoin (John). See Mac Keown.|
|MacKeown||Very numerous: Ulster generally, Louth etc. Ir. Mac Eoin (Ulster). As Mac Keon.|