There are still several names used for characters from Fire Emblem if/Fates that are fanmade and do not correspond with the official romanizations used in the game's internal files and the official character book. Below is a list of names.
Elfie -> Elfi
Cyrus -> Silas
Marx -> Marks
Belka -> Berka
I don't know if this covers all of them, but it would be nice to see the official romanizations being used on this site rather than fanmade ones.
Thank you for reading.