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Very interesting. Which parishes?

Right now I can't direct you to a Rose McDunn in Canada, that has not been my focus. I have been aware of a McDunn woman who married a Levesque in Canada. There has been that presence in Canada for a very long time. Going back to McDunns in Ireland, I have been able to trace the name back to 1623+\-. That McDunn looked as though he was a gamekeeper and he appeared in that year's census. As to McDunn in US, there was a James in Baltimore,MD in1777. There are McDunns living in northern NY in 1795 and early 1800s. I suspect they were British loyalists who fled to Canada intending to return after the British won the Rev War. They probably lost their holdings in the US and decided to remain in Canada. I'll give you some counties or parishes: Fermanagh, dummiller, terribuske,derryvollan?,maghery cross, Ennis mcsaint. Sorry, I wrote that a long time ago and I'm sure I've screwed up along the way.
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I know it has been awhile since you asked your question but I am a mcdunn and the family has had a presence in westmeath for many years. I'm doing some research right now, lots of Marys and roses. Good luck!