There are a number of ways to pronounce the surname but by far the most common is to say the GIL as you would the feminine firstname JILL. There are many ways to spell the surname and my research suggests they are likely to be related. Examples are Gilks, Gelks, Ghilks, Jilks, Jelks, Ghilkes, Gelkes, Jilkes, Jelkes, Gylks etc. David Smith, manager of the Gilkes One Name Study.
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