Hi Ledingham1
In my Davidson tree, I have at least 10 Ledinghams but not in the direct line that I can tell. Closest is Elizabeth Ledingham 1819-1895 that married George Cooper of Wraes. Their son John Alexander Cooper married my great grandmother Jeannie Davidson nee Allan after her first husband (my great grandfather) died.
Another is Elspeth Ledingham 1781-1865 who married John Davidson, a 2nd cousin of my great great grandfather (I think I have the greats right!)
I didn't know about the royal connection, I'd always assumed there was no Stuart connection at all. I'd love to know more.