Many Scots settlers in Fermanagh came from the Scottish borders. Common names were Graham, Armstrong, Hogg etc. King James I urgently needed settlers in Fermanagh as a part of the plantation of Ulster which started in 1610. There was a problem at the time of extreme lawlessness along the Scottish border with travellers regularly being robbed, cattle rustling as well as regular skirmishes between the Scots and the English. They were known as border reivers (reiver being a Scots word for a thief). King James’s masterstroke was to solve two problems at once by moving large numbers of border Scots to Fermanagh, so bringing peace to the borders and a new population to Fermanagh. They were moved in the 1600s and no detailed records exist of exactly who came or precisely where they came from, save that they came from the borders, so I doubt you will be able to make that link back to Scotland.
If it’s of any interest, the border reivers are very proud of their heritage and have a website, which lists the Grahams, amongst others: