A few notes......

In the original version of FF2, Frioniel's name WAS written as Frioniel.... transliterated as well as can be done in Japanese....

Fu-ryo-ni-e-ru

As for Leon's original name.... It was actually Lionheart.

Re-o-n-ha-to

As for Mindu, Demiforce named him "Minh" although his original Japanese name was spelled

Mi-n-u-u which I've seen translated as "Ming Wu". I have no idea what Amano named him, can anyone find out?