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Drill down further...
GERA GERB GERC GERD GERE GERF GERG GERH GERI GERK GERL GERM GERN GERO GERP GERR GERS GERT GERU GERV GERW GERZ
Surnames shown in bold text represent around 90% of the population of Great Britain. All other names are very uncommon in the UK and we are unlikely to have any useful data on them.