This webpage is from Ancestry.com, but is one of their free pages. Enter the surname you are interested in and you will see a map (you can actually choose from United States, England & Wales, and Scotland) that shows the population density of your chosen surname. You can filter the display by selected decades.
You will also see displays about the surname's origin, immigration information, average life expectancy, and more.
Some of the displays will try and influence you to subscribe to Ancestry.com to see more, but the free information offered is worth checking out.
Last Name Meanings and Origins | Search Surnames at Ancestry.com:
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