Viper would of been better if it had a different name

[fulminating]

Beyond the name there's no link between FF XIV Dragoon and those Dragoons. It's just a coincidence they have a similar named.
Don't forget the original name is "Dragon Knight", not "Dragoon".

Final Fantasy Dragoons are named after the mythical Dragons, not a british cavalry.
If you want to argue otherwise, please show an interview where the development team mentionned this british cavalry being the origin of inspiration.

Look, there's a fighter aircraft named the "Viper", is anyone complaining it doesn't shoot toxic missiles?

Japanese: Dragon Knight (竜騎士, Ryuukishi). This is just decent localisation.