I have a little information. Mary Monck is my ggf's sister (Francis Henry Monck). His son Herbert Clarence Henry Monck (Ryon) is my grandfather. Francis Henry Monck and Margaret McFarland (my ggm) died of Tuberculosis in Cleveland, Ohio and Herbert was adopted by the Ryon's. There are a few Monck's buried in Cleveland.
I have Francis Monck you mention below as Francis Garnet Monck II b abt. 1800, Wexford and d 20 Feb 1867, Toronto. His parents as James Henry Monck, b abt. 1761, Mayo, Ireland and Gliz Eakins b abt. 1770, Wexford. I think there is a link to 2 Moncks who died in Scullabogue.
I know there are Monck's in Colorado but communication with them has not been successful.