Hello Wendy
We may have been in touch before. So far I have got no further back than the David Isaac who was married to Sophia Mathieson - I too would be keen to learn more. What rumours have you heard about David Isaac's origins?
I did learn more about the family of David Isaac's son John - "my" part of that family. The eldest son was always either David Isaac or John Isaac, turn and turn about. If the eldest was David then one other son would be called John - and if the eldest son was named John then another son was called David. That held good for at least 5 generations.
My grandfather, a John Isaac, had children named David, William, John, James, Robert, Jean and Christina - six of those names match the names of the children of David Isaac and Sophia Mathieson, which can't be coincidence. It suggests my grandfather had a record going back at least three generations (i.e. to David Isaac, husband of Sophia); if I can find out what happened to his records then there may be some other clues as to origin.
If I have any future success tracking David Isaac I will post again on this forum.
Mike Isaac