This map and others on this website indicate the distribution of the Baker surname in the British Isles. This one shows the current distribution. Other maps show historical distribution.
The likelihood that our Bakers came from one of these areas is greater than in an unconcentrated area. Of course, this does NOT rule out the possibility that we came from an area of historically few Bakers living in it. Only DNA data will help us narrow down our search.
Notice how closely this matches another surname concentration map that has a DNA-derived concentration map overlaid. The surname concentrations on this second map are the reddish areas—not the DNA-related circles.