I know this is an old post but I do have information of John Kenny.
The family was Church of Ireland and continued to intermarry with other protestant families in the area for a number of generations. John Kenny married Jane Susan Finney the daughter of Richard Finney and Frances Browne who had married at St James C of I in Dublin on 1 Nov 1794. The family moved to Eyrecourt, Clonfert, Galway where Jane Susan Finney was born c1803. I have the following children for John:
1. Henry Kenny b. c1825 Co. Galway d. 6 May 1870 Lismore House, Laurencetown, Co. Galway
2. Sarah Kenny b. c1828 Co. Galway m. James Johnston (7 known children) d. 14 Jul 1874 Fohanagh House, Clonbrook, Co. Galway age 46
3. Frances "Fanny" Kenny b. 1830 Lismore House, Earlscourt, Co. Galway m. John Bailey 18 Oct 1854 Melbourne Australia (5 known children) d. 1 Nov 1875 Tasmania, Australia
4. Richard Kenny b. c1832 Co. Galway d. 1897 Mountbellew, Co Galway age 65
5. John Kenny b. c1834 Co. Galway d. 1905 Castlereagh age 71
6. Thomas Kenny b. c1837 Co. Galway m. sarah Kenny d. of Thomas Kenny and Miss Horseman and had a son also Thomas. Maybe this is wrong and she was a daughter of Henry and Miss Horseman as I can't find my source for this. I think it was Tom Johnston who did a lot of research into the Kenny and Johnston families as well as the Finney's and related families (all the protestant families seemed to intermarry).
7. Susan Kenny b. c1839 Co. Galway m. John Johnstone (son of Samuel Johnston and Mary A Duffy) on 28 Apr 1858 d. 18 Oct 1874 Smith Park, Ahascragh, Clonbrock, Co. Galway, Ireland
8. George Kenny b. c1840 Co. Galway m. Frances Fitzroy 1 Jun 1875 Church of Moystown, Co. Offaly
9. Stephen Kenny b. c1852 Co. Galway d. 11 May 1880 Ballinasloe age 28
John Kenny died in Ballinasloe, Co. Galway in 1877. Jane Susan Finney died Lismore House, Laurencetown 18 Mar 1881.
John Kenny's sister Anne married Robert Finney with children Thomas (1831), Frances (1838), Richard Noble (1839), Mary Anne (1841), Robert (1842) and Sarah Jane (1843).