It’s very hard to trace ancestors who left Ireland in the 1700s. There are very few records to consult. In addition these are both quite common names. (The 1901 census has 650 Wylie/Wiley and 275 McNeilly). Few families here in Ireland would be able to trace back to the 1750s, so connecting your ancestor with living descendants will be hard, especially if you don’t know where in the county yours lived. But hopefully someone reading this may be able to make a connection for you.