|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 Keagan and a second surname are found together
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