You don’t say what denomination the couple were. If the marriage was Church of Ireland, and in Clogher, then the parish marriage records start in 1777. There is a copy in PRONI, Belfast. (They are not on-line). Marriage records at that time often didn’t contain the couple’s parents names. Sometimes all you get is the couples names and their 2 witnesses. Tradition was to marry in the bride’s church, so if you find the marriage there, I’d look for her baptism and that of any siblings, and you may get the parents names from that.