Many 17th century settlers to the future Northumberland and Westmoreland Counties of the Northern Neck of Virginia where originally in the Province of Maryland.  Two very useful resources are 1) the Archives of Maryland Online

http://aomol.net/megafile/msa/speccol/sc2900/sc2908/html/volumes.html 

After you click on a specific volume, there is a menu in the center of the page which includes 
"Index to Names of Persons and Places". You may find your person of interest there.

And 2)  Dr. Lois Green Carr's: "St Mary's City Career File" . Dr. Carr - Historian, Historic St. Mary's City - has placed images of her research index cards online for a number of early settlers, men and women.  In other words, Dr. Carr has performed much of the research for you. I found 69 index card images for a Francis Gray.

http://query.mdarchives.state.md.us/texis/search?mode=&opts=adv&dropXSL=html&prox=page&rorder=500&rprox=500&rdfreq=500&rwfreq=500&rlead=500&rdepth=0&sufs=0&order=r&pr=carr_group&query=&submit=Submit 

In the drop down menu on the left of this webpage, replace "All" with  "St Mary's City Career File", then type in the person's name after "Search for".

William Milam

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