| Cogan | numerous: all areas except Ulster and Mid-West. Ir. de Cógan, Ó Cuagáin. Anglo-Normans who settled in Cork, the name also occurs as Coggan, Gogan and Goggin. Secondly, an Irish name synonymous with Coogan, q.v.MIF. |
| Coggin | fairly rare: Sligo etc. A variant of Cogan, which itself, in that area, can stand for Ir. Mac Cogadhain as well as Ó Cuagáin and de Cógan. SI. |
| Coogan | fairly numerous: Monaghan and Leinster generally. Ir. Ó Cuagáin. A branch of the Uí Maine (Galway), now dispersed. |
| De Cogan | Very rare: Cork. Ir. Lang. See Cogan. |
| de Cogán | Cogan, Goggin: líonmhar seachas i gC. Uladh & an Meán-Iarthair. Tháinig Milo de Cogan le de Cléir (Strongbow) i 1170 agus fuair tailte fairsinge i gCorcaigh. Chlaochlaigh an sloinne go Gogán sa chaoi is go raibh Rath Gogáin ar an áit ina bhfuil Charleville anois. Chomh maith leis sin, tá na sloinnte Gaelacha Ó Cuagáin & Mac Cogadháin, a aistríodh go Cogan, ann. Féach orthu san, leis.MIF. |
| Mac Cogadháin | Cogan, Coggin: cíosach annamh: Sligeach & rl. Clann a áitigh dúiche dar b'ainm Clann Fearnaighe i Liatroim. On ainm pearsanta Cúchogaidh. Litriú nua: Mac Cogáin. Féach Mac Cogaidhín.MIF. |
| Ó Cuagáin | Coogan: cuíosach líonmhar: Muineachán, Laighin. Clann de chuid Uí Maine (Gaillimh). Féach de Cogán, leis. |
Parishes where O'Cogan and a second surname are found together
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