Betty -- I don't have any proof, but suspect your William David AKER may be brother to my Jackson AKER who was born abt 1812 in Wythe County to Michael AKER and Catherine HEPNER.
Michael & Catherine were originally from Shenandoah County, Virginia; married 10 Feb 1790 up there.
Hope this helps.Jackson had brother Samuel (confirmed).
I also suspect Benjamin F. AKER of Wythe County who married a Sarah E. AKER in 1837 to be a sibling of Jackson (timing is right) and perhaps Jefferson AKER (poss. Thomas Jefferson AKER) who married Eve HINES.Another possible sibling is Michael AKER who married Rebecca ARNOLD in 1850.