| Droogan | Very rare: Tyrone. Ir. Ó Druagáin. See Drugan. |
| Drugan | rare: Fermanagh-Leitrim. Ir. Ó Druagáin. Originally an ecclesiastical family of Armagh. The drua root in the names may refer to druadh, a druid. |
| Ó Druagáin | Droogan, Drugan: annamh: Tír Eoghain-Fear Manach-Liatroim. Clann airchinneach in Ard Mhacha, tráth. Éagsúil le Ó Druacháin, de réir dealraimh. SI. |
Parishes where Drugan and a second surname are found together
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