"Surname mapping is a useful technique for a surname DNA project. Many surnames have regional distribution patterns. Mapping the distribution of a surname at different points in time will often reveal the origin of the family name and will thus provide a narrower focus for further research and for recruitment efforts. Surname maps are generally created using information from censuses, electoral registers and telephone directories."
Lots of countries http://isogg.org/wiki/Surname_mapping
Cheers,
Pat
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