Morrison
The Surnames of Ireland by MacLysaght states:
(pg. 222) Morrison: An English name numerous in Ulster. See Bryson.
pg. 29 Bryson: This English name, alias Briceson, is used in Cos. Donegal and Derry as the modern form of OMuigheasain, first anglicized as O'Mrisane and later sometimes O'Morison, Muirgheas (sea valour) equates with Maurice. MIF
There are two clans that the surname Morrison belongs to, Buchanan and Morrison clans.
My Morrison Ancestor is Martha Morrison, click to find out what I know.
Links
Badges frome The Clan Buchanan web page and The Clan Morrison web page.
Tartan from The Clan Morrison web page.