I'm related by marriage to John Mooney (~1810-~1869) who was married to Mary Ann Kincart/Cathcart (~1810-1899). Their grandson (John Mooney, son of John Mooney) was my grandmother's first husband. Over the generations, the whole family appear to has moved frequently back and forth between the Ballymena area in Antrim and Glasgow (eg my grandmother had three children to John Mooney, two born in Bellshill outside of Glasgow, one in Ballymena).
Perhaps the first John Mooney was the (grand-)father of some of these children?