http://www.4crests.com/budge-scottish.html
A coat of arms is a symbol that represents a country, institution, family, or Royal Personage.
Marriage, promotion, acquisition of additional titles, receipt of honors.
The Coat of Arms was invented in Feudal Europe before the concept of the Nation State (or country) was developed.
You can buy a coat of arms from any artist willing to create one and sell it to you, as long as you are not in a country where heraldry still has legal support, limiting who can have arms, etc. In...
Try the Drake family (descendants of Francis Drake) and Goodwinson descendants of early English Kings. See also the Bayeux tapestry.