Adam Koontz and Mary (Edna) Diehl?

I've been trying to trace Adam and his wife again as of late and I am worried that there isn't any evidence his wife was a Diehl.  If anyone has evidence, please let me know.  I thought I did but since it's been a while since I looked at this family, I'm concerned that I don't remember nor do I seem to have what that is.

I also don't know why she's referred to as Mary/Edna.  In his will his wife's name is clearly Mary.

Thanks for any help clearing this up.  In the meantime I'll be posting about what I've found in Loudoun (some of which I already posted previously).