Dave,
I live in Obin St Portadown and dont recognize the name McLyndon. However the name McAlinden is well known around town.
I don't think there are any McAlindens left in Obin St. - though some of those who did live there are still in or around town.
I am a Mulholland, had an uncle named Cornelius who died in the sixties. With a name like that there is almost certainly some connection.
Where are you now ?