Hello It was some while ago that you posted your message and, no doubt, your research has moved along somewhat. However, I thought I'd mention that I may have a link to your DAVALLs (and to Philip Abel's DAVALLS, in the the earlier posting). My husband's gt-grandmother was Emma Elizabeth Ann DAVALL (1872-1954). Her parents were George DAVALL and Sarah MUMMERY. George's parents were William DAVALL and Mary Ann TAYLOR.
William DAVALL had a number of siblings, one of whom was Daniel DAVALL whose son was Roland Charles DAVALL.