Well....there is evidence in the parish records for the existence of George Campbell Grange in the late 17th century.
Kenneth Campbell alias Grange, living in Durine then Croispol and married to Janet Campbell, is designed as MacNishmacEorish - son of Angus the son of George. Kenneth and Janet had their first child baptised in 1784, so Kenneth is likely to have been born c. 1755, making a grandfather born on the 1680s plausible.
The Granges initally settled the narrow strip between the Kyle of Durness and Durine on the north coast - Hugh, John (a Chelsea Pensioner) and Donald MacRob in Sarsgrum/Keodale, Alexander in Achunahanait, another Donald in Keodale, Thomas in Croispol, Iye/Aiodh in Durine and George in Balvoolich. Donald MacRob moved north-east to Ceannabeinne and then to Eilean Choraidh by the late 1770s.