Everyone has their own double standards about the names of stuff: few care about myrmidons being called myrmidons, but you see people change wyvern classes to dragon/draco/etc all the time because the scaly flying mounts (except Valter’s) have front legs whereas the localisers of FE7 were only concerned with preserving the difference between ドラゴン (the thing that Heath rides) and 竜 (the things that were defeated 1000 years ago and Nergal is trying to bring back).
In my opinion, the name of a class that existed in vanilla games should be changed only if its role in either the story or gameplay has been changed as well. For a story example, if I wanted a speedy axe-using class but pirates didn’t have any big role in my setting, I’d change the name of the pirate class to something more suitable. If dragons/manaketes have no special role in your story, there is no repercussion for changing wyverns to dragons. If your main character isn’t of noble background, you don’t need to call them a lord… and for crying out loud, you don’t need to insert an obligatory steppe horde into your setting just so you can have horse archers; you can just call them hunters instead of nomads. In terms of gameplay, if you are giving knights 5 movement to encourage people to use them, you might also change the class name to get rid of the “ew, Knight! bench immediately!” kneejerk reaction. If you want to split cavaliers into sword knights and lance knights, you might end up calling them hussars and cossacks to differentiate them while adding the same kind of flavour to the class names that the localisers did with myrmidons.
Something like calling archers “shooters” when they’re exactly the same as vanilla archers, though? That’s the class-name equivalent of changing iron swords to Militant Edges.