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| Roantree | Quite numerous: Dublin etc. See Rountree. |
| Roundtree | rare: Meath etc. See Rountree. |
| Rountree | Quite numerous: Armagh, Meath etc. Ir. Ó Caorthannáin, caorthann, rowan-tree. The name is English but in Ireland 14 cent. It is now a Yorkshire name, usually Rowntree. |
| Rowantree | rare: Down etc. See Rowntree. |
| Rowntree | fairly rare: Armagh-Down-Monaghan. Evidently an English name, it appeared in Oriel (Armagh-Monaghan) in 14 cent. It now occurs as Rowantree, Rountree, Roundtree and in Irish, by translation, Ó Caorthannáin. SI. |
Parishes where a Roundtree and a second surname married each other.