What was so good about Naamah the Ammonite? Tosfos on bava kamma 38b s.v. moavim, seems to indicate that the language is lav dafka (not specific) and that ammon is not really included!
What was so good about Naamah the Ammonite? @jake having righteous offspring doesn't make the forbear righteous themselves. Examples would include Terach, Besuel, Haman, Achaz etc.