
The Factbook cannot be accessed by trying to find the person Ammon (not the region Ammon) directly. However if you
- search for a translation using Ammon as I did above
- open that translation
- open the context menu for the person, you can find that the person Ammon is called Benammi is Factbook.
Given that his descendents are called Ammonites and that the NABRE is a major translation and that even if you know the alternative name you might spell it Ben-ammi, I strongly believe that the alternative name should appear on the Factbook record.

I find this even more problematic because I have yet to find the magic search argument that would tell me when the person tag associated with Ammon is not "Ammon" i.e. a more direct way to find alternative names.