Ahhhhhhh....something I'd not yet considered. (I'm not desperately trying to find excuses for wearing a kilt - I'd wear them anyway).
I was overlooking my father's mother's maiden name of Crane. According to at least one Scottish surname website, Crane is associated with the area of Aberdeenshire. Bingo.
Now, in protocol circles, does this mean that I have some kind of distant affiliation to the Aberdeenshire Area tartan that I can wear justly and proudly? Or am I just clutching at straws? Again.