Thanks, Hugh.
Your name interests me - do you know if you had forebears who came from Caithness or Sutherland in northern Scotland? I belong to Golspie in Sutherland, and Gunn was a very common surname, along with Mackay and Sutherland.
I believe the Gunn clan was one of Scotland's oldest and its origins are Viking; the name literally means "war". But you probably know far more than I do.