Robertson, Robinson, Robison

[StevieR]

Robertson is the surname most usually associated with Clan Donnachaidh. There are a number of other septs but I wasn't aware that Robinson was one of them. In the UK at least, Robinson is accepted as being a particularly English surname and Robertson a Scots one.

Clan Donnachaidh, particularly Robertsons from the 17th century onward, have a long and colourful history and are a notable highland clan.