Anna Coy

Apparently this individual is asserted in the Miller-Coy Ancestry:

http://millercoy.tribalpages.com/family-tree/millercoy/124/8565/Ann...

Others assert that the wife is named Anne (no last name):

http://gw5.geneanet.org/index.php3?b=twjc134&lang=fr;pz=jesse+lea;n...

Others assert Abigail:

http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=REG&db=mattcoy&i...

And others assert that her name is not known.

As DeWitt is a Dutch last name, it is possible that, if she was a DeWitt, that she may have retained her birth name. There are no primary sources, either way.