No Cowgan households in Griffith's.
| 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. |
| Ó Cuagáin | Coogan: cuíosach líonmhar: Muineachán, Laighin. Clann de chuid Uí Maine (Gaillimh). Féach de Cogán, leis. |
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