There are 23 unique JP surnames beginning with G:

Gabriel	Galland	Gamble	Gandy	Gardiner	Gardner	Garrard
Gates	Gebert	Gerrard	Gill	Gillespie	Gladhill	Godfrey
Goff	Gooding	Goodwin	Gosnell	Graham	Granger	Greeman
Griswold	Grubbs

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