Hi S.,
I appreciate the problem, but I'm not sure auto-filling from the other name fields is appropriate.
It's what we do when the profile is created, e.g. if you don't enter a Current Last Name it defaults to what is entered as the Last Name at Birth. I'm not sure it's appropriate here. It could be very frustrating for some users. Often they are trying to delete family information because they're already frustrated for some reason.
We decided to have "Anonymous" auto-filled because anonymizing the profile is generally what the user is trying to do by deleting the name field. That is, they're trying to delete the name. If we required that they fill in something else, many people would put in junk.
"Anonymous" is the right thing to put in these fields in these cases. If we didn't autofill it, many people would put something else or mispell it. It is, after all, a hard word to spell. If it's not spelled correctly it defeats the purpose in some contexts, technically speaking.
I'm not just speculating. This is what happened before we started autofilling with "Anonymous. " People were entering junk characters when they discovered they couldn't easily delete profiles.
We went ahead and added a little bit of additional explanation, on the edit page and linked on the Name Fields page.
We can also have a little pop-up appear when you clear a name field. That would help a lot.
Chris