Dear Caswellm,
You were looking for Wilsons of Cavan. Here is another. Rachel Wilson (born about 1809 in "Ireland") married Edward Harrison of Cootehill, Cavan, about 1830. They had an eldest son James Harrison and then in 1832 sailed for Canada, settling in Peel County Ontario. His siblings were on Wolfe Island, Ontario. The Harrison family was Presbyterian, as were many Wilsons I have come across.
I know nothing about Rachel's origins. Im putting together a tree, I rely heavily on the Irish naming tradition. Rachel named her four daughters in this order: Margaret, Mary, Jane, Rachel. If Edward and Rachel senior followed that tradition-and his parents and uncle did not, but cousins did--then this might hold true. Maybe Rachel's mother was Margaret, her eldest sister was Mary, she herself should have been Jane, and a favorite sister would have been Rachel. (But you see that Jane and Rachel are switched.)
The mother's name for Edward was Frances, a name not used by Edward and Rachel for their daughters. Good luck with your Wilsons. I have many.
Polly LYNN