...whips were never actually used in combat and if they were, it wasn't widespread
Not for 14th century Europe, no.
However, predecessors of the nasty South African sjambok are recorded in India and Indonesia in the 17th century and surely existed before then. Then there's the very dangerous
buntot pagi of the Philippines, which is made from the tail of a stingray and retains the venom - the longer it is (and therefore the larger and more dangerous the ray it came from) the more prized it is - the Filipino Royal Collection has a six-footer, typical combat-ready ones are 4.5 feet. I'd love to see one of these modded into the game, with the venom effects.
And of course, the good ol' U S of A invented the blacksnake, which is a normal bullwhip, but with a handle that is a disguised blackjack. Doesn't use the same skillset of course.
One thing on whip combat - almost everywhere where combat whips have been used, the wielder has a knife in the other hand to deal with an opponent who breaches the striking zone. Until more realistic hand-to-hand striking zones are modelled, and until multi-wielding is in, simulating whip combat will be quite unrealistic anyway.