James Mernagh
- Married: Mary (Byrne) Mernagh, February 2, 1798, Kilanerin Parish, Gorey, County Wexford, Ireland
- Children:
- Nicholas Mernagh, 1790-1874
- Elinor Mernagh, April 30, 1795-
- Patrick Merna, 1795-1869
- Mary Merna, 1803-1903
- Murtha Mernagh, May 20, 1807-
- Martin Merna, 1809-1909
- James Mernagh, 1810-1880
- Dorothy Mernagh, 1812-