Dear Larry - Yes, I know of David Mabray in Rusk Co. TX in 1850. He was my gggg-grandfather, married to a lady named Cynthia and was father to Jasper Newton Mabray, my ggg-grandfather.
Jasper was Texas Ranger and county clerk for newly-formed Bosque Co. TX Also was father of first white child born in Bosque Co., Martha Mabray.
I have info from David down, but none of his parents up. Do you know who his folks were or where he was born? I know David was sheriff of Yalobusha Co. MS back in 1830s as his daughter married then. Not having much luck regarding his ancestors, though.
Have you checked out the Mabry/Mabray/Mayberry surname page? The one I"m referring to is operated by Don Collins and has a great deal of info - unfortunately, he's stumped on this line as well but has emailed me he is considering hiring a professional genealogist to find this needle in the haystack.
Hope I've been of some help.BTW, is Mabra connected to Mabray?- Laura