This may be totally irrelevant to your inquiry but I have a Grant family connection in Banffshire though do not have a precise locality, unfortunately. My g.g.g. grandmother was Elspet Grant born c. 1815. She married Alexander Stewart from Cullen in 1830 and they had seven children together: Elspeth (1833), Alexander (1835), John, my g.g. grandfather (1836), George (1838), James (1841), Daniel (1843) & William (1845). For a while the family lived /worked at Cullen House. Elspet died some time between birth of the last child and 1850. In that year Alexander married for a second time. Frustratingly, I have almost no info. about Elspet besides her marriage details etc. - I can find no birth /death records. As I say, this Grant may have nothing to do with your inquiry but thought I would just let you know just on the off-chance that there is a connection.
Doddie