Scottish Surnames
Scottish surnames divide themselves into two classes, Highland, and Lowland. In very few instances were they assigned before the eleventh century, and indeed by far the larger proportion, since the thirteenth century. They have originated in various ways. Some are derived from localities, as Maxwell, Nisbet, Ralston ; baptismal names, as Anderson, Bennett, Lawrence ; trades, as Baxter, Fletcher, Nasmyth ; offices, as Bannerman, Grieve, Walker; professions, as Clerk, Freer, Kemp; peculiarities of body and mind, as Fairfax, Laing, May; armorial bearings, as Cross, Heart, Horn ; nativity, as Fleming, Inglis, Scott; and from many other sources. Highland surnames are chiefly patronymics, with various prefixes and additions, as Farquhar, Mackenzie, Robertson ; but there are some exceptions, a few being derived from localities, as Lennox, Murray, Ross ; a good number from peculiarities, as Cameron, Campbell, Grant; and some from armorial bearings, and offices, as Frazer, Skene, Stewart. Lowland surnames having been adopted mainly through Norman influence, are most frequently local, as Carmichael, Ridell, Rutherford; but many are derived from baptismal names, as Dickson, Henderson, Syme ; from peculiarities, as Armstrong, Brown, Douglas; from armorial bearings, as Foulis, Heron, Lillie ; from office, occupation, and trade, as Baillie, Hunter, Lorimer.
In Scotland, whoever joined a particular clan, no matter what his position or descent, assumed the surname of his chief, and this was accepted as an act of loyalty ; it does not follow, therefore, that all who bear the same surname are descended from a common ancestor. Originally, all surnames had a meaning, but in very many cases this has been lost because of the corruptions in spelling, for their orthography has only been fixed in the last two centuries. It is, therefore, probably impossible to render correctly the origin and significance of all Scottish surnames.
-from The Origin and Signification of Scottish Surnames, 1862, Clifford Stanley Sims