LDS British Vital records has two children born to William Gillett and Martha and recorded in Gillingham, Kent:
William: bapt 25 Nov 1722
Ann, bapt: 16 Mar 1729

RCLPL also has Anne but baptised at Gillingham on March 16 1769, which has to be wrong.

RCLP-L also shows an Elizabeth baptised at Gillingham on Nov 20 (or 28) 1725.

Finally RCLP-L shows another family of Gilletts in Gillingham, a Thos who married Eliz Peacock on Dec 14, 1712 and had three children: Thos, bapt at Chatham on 4.10.1713, Sarah, bapt at Gillingham on 4.1.1718 & John bapt at Gillingham on 21 Jan 1723.

These look right apart from the absence of Jonathan - or is he on IGI?
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TFPL, Sep 2004, found on Ancestry.com (a relation?):

England: Canterbury - Administrations in the Prerogative Court of Canterbury, 1649-1654
Index of Acts of Administration in the Prerogative Court of Canterbury 1649-1654  
County: General  
Country: England  
Gillett, John, bach., Chatham, Kent, died overseas 1651 147  
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