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Drill down further...
GILA GILB GILC GILD GILE GILF GILG GILH GILI GILJ GILK GILL GILM GILN GILO GILP GILR GILS GILT GILU GILV GILW GILY GILZ
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.