| 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. |
Parishes where McKeoan and a second surname are found together
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