Trakehner - Terrific post! Thanks so much! I love reading research into the origins of certain words. It isn’t surprising that most of our odd words “morphed” from something more identifiable to “regular words” used in long ago language - be it Native American, or old European, or Far East.
I thought the “gee” and “haw” were more French in origin - being specifically used by the early French mushers as the norm for controlling the direction of their sled dogs. Considering that French (and Latin) were the language of the learned in the middle centuries (old English or Middle English being very coarse (ie: “common”) at the time and not inclined to be that much a part of the popular lexicon) I would think - this just being my VHO – these two words probably have morphed from another language other than English…especially in light that the French would rather be garroted and hung from a tree upside down than utter a phrase with English origins. :lol: Even that one reference you mentioned suggests a non-English origin.
To the OP - you can say “gee” and “haw” and anything you want to cue your driving horses during a show - and that includes Devon and Walnut Hill, and Madison Square Gardens. Any code words, historic or otherwise. Heck, you could invent your own and be the envy of all the other drivers there! As has been already stated, there is no rule against it, and it is not looked down upon. If it helps you better communicate with your horse or pony, then go for it. Just don’t shout it or say it out loud so that someone nearby can also hear it. It needs to be said in a low voice or whisper so that only your horses can hear it. Not anyone else.
I use the words “come about” to my ponies when I want them to make a tight 90 degree, or full 180 degree, turn in either direction with very light pressure on the leading rein. They know the word means to turn tightly, but the rein is what directs them which way to turn. They are so used to this cue that I can release rein pressure altogether while they execute the turn on just the words alone. When they have turned as much as I want, light rein pressure on the opposing rein, and the words “good ponies” is all they need to know they have executed the turn to my satisfaction, and they stop turning.
I, myself, tend to be <ahem> “directionally challenged” and would only confuse myself if I had to try and remember which directions gee and haw represent! “Come about” -with the rein to show the way- is so much easier…for all of us! :lol::lol: