Random dumb question: Why is it called Dragoon when its clearly a Pikeman?

[Wyakin]

I know, I know... I haft to ask the obvious though.

Anyone whose ever played a Civ based game knows Lancers upgrade to Pikeman.

Dudes with long spears have always been Pikeman.

Dragoons are units that ride horses/vehicles to the battle zone and dismount and arn't necessarily even melee units.

So.... why?

Did you skip the entirety of heavensward?