No MacKeegan households in Griffith's.
| Egan | v numerous: Connacht, Midlands, N Munster. Ir. Mac Aodhagáin, mod. Mac Aogáin. Some were a brehon family attached to O'Connor of Offaly. Also as Keegan. The name is a diminutive of Aodh, fire. IF,MIF & SGG. |
| Keegan | Very numerous: Leinster & Connacht with moderate numbers in Ulster. See also Egan. The Irish is Mac Aodhagáin (dimin. of Aodh, fire). Ó Caogáin in spoken language. |
| Mac Aodhagáin | rare: scattered. Ir. Lang. See Egan. |
| MacKeegan | Quite numerous: Derry-Antrim. Ir. Mac Aodhagáin, from dimin. of Aodh, "fire". Known as a brehon (lawyer) family attached to various septs. See Keegan. SGG. |
| Ó Caogáin | Keegan: líonmhar: Laighin & Connachta. Is truailliú é seo ar Mac Aodhagáin, q.v. |
Parishes where MacKeegan and a second surname are found together
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