Thanks to this world map that shows the density of people with the surname Dedham in different countries, you can get an idea not only of the popularity of the surname Dedham in each country but also of the different migrations of people surnamed Dedham.
The quantity of people with the surname Dedham that we can find in each country can help us discern the origin of the surname Dedham, as logic tells us that the place with the most people surnamed Dedham will be the country or area of origin of the surname Dedham.