I don't know if I'm the only Scot that didn't know/is very surprised at this, but on researching a branch of my family from Banffshire to Jamaica (with the army) I found that there was already a large concentration of their unusual surname there (Farquharson) - anyway it turns out that some of these people were Jacobites shipped over after Culloden. I was horrified to find that there is a place called Farquharson Wharf where slaves were bought and sold, and the UCL slave-owners study has a great deal of north-east Scotland names.