Hi,

There are some who believe the surname Cowan is related to Clan Colquhoun. You may be interested to compare results of your Scottish DNA project with that of the Cowan surname DNA project at http://freepages.genealogy.rootsweb.com/~cowandnagenealogy/C...
or
http://www.thecolefamily.com/hobby/cowandna.htm

Hope this helps someone!
Cyndi