James, in researching the Magoffin history I have uncovered a reference to McGivern. Magoffin's were at a Townland of Ardbrin which is near Katesbridge, Near Banbridge Co. Down. The earliest reference I can find regarding Ardbrin is that a McGivern family owned 1080 acres there in the early 1600's (which is very early as far as our kind of reseach goes). I thought McGivern may be a hash up of Magoffin so I did a search on McGivern and you guys came up. Since there appear to have been McGivern in this area it is likely to be your lot.. Over to you.