Look up Rev. Isaac Callison on this site.He may be an ancestor (or related to an ancestor) of your Isaac Callison.There are 2 different threads that list Rev. Isaac Callison with Daughter Millicent (b abt 1758 in Orange or Rich Creek, Giles Virginia. d abt 1841 Monroe (now West) Virginia) .The places and dates they list may give you an idea of where to look for your information.
(I'm pretty sure one of my older relations is named Melvina, it may be a family name)
Remember that West Virginia was part of Virginia before the Civil War.