Hi,
Here is some more info on Michael LAWN name appearing in Donaghmore records:
Religious Census of 1766:
Michl. LAWN (transcriber notes it may actually be "Nichl" as in Nicholas?)
Listed as protestant family in Donaghmore
1796 Spinning wheel premium entitlements list, County Donegal:
Michael LAWN, Donaghmore
1828 Tithe Appointment record
Michael LAWN
(I don't have the details for this one-- I just found the name in an index for C. Donegal
There are also 2 Michael LAWNS listed in the 1857 Griffiths evaluation, but I guess your Michael LAWN was already in Scotland by then.
Hope this helps.
Chas