For background on how the map was made (and its flaws), see the relevant blog entry.
|Guckian||Quite numerous: Leitrim. Ir. Mag Uiginn, possibly from Uiging, a Viking. This name occurs mainly in Ulster as MacGuigan and MacGuckin, q.v. MIF.|
|Mac Guaicín||Guckian: annamh: Liatroim. Féach Mag Uiginn.|
|MacGookin||fairly numerous: Antrim etc. Ir. Mac Guaicín for Mag Eochaidhín according to Woulfe, but MacLysaght regards it as variant of Mac Guigan, q.v.|
|MacGucken||fairly rare: Tyrone-Derry etc. Ir. Mag Uiginn. See MacGuigan, but also compare Mac Guckin.|
|MacGuckin||Derry-Tyrone-Antrim etc. Ir. Mag Eocháin (from first name Eocha). Evident confusion with Mac Gucken. See also Mac Guigan.|
|Magookin||Very rare: Down. Variant of Mac Gookin, q.v.|