[Yosemitest]

The first source I used got the name wrong.
Here’s one more source:

Embattled GOP Senate candidate Roy Moore's attorney implies his signature in a girl's high school yearbook was a forgery

“ … "Judge Moore looked at that D.A. after that signature," Jauregui said.
“No, he wasn't, he was the assistant district attorney."
He added that Moore's assistant when he was presiding over Nelson's divorce proceedings was named Delver Adams,
who typically stamped his initials on court filings. … ”

I believe that it's a forgery from Mrs. Nelson's divorce papers with had that stamp.
I think it's either a traced copy from those papers,
or someone got Delver Adams' stamp and masked one side of it, in order to stamp the rest of that signature.

But ... I'm guessing.

[RegulatorCountry]

It’s Delbra. Not Deborah, not Delver. Delbra.