Charlie Horse?

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So why is it called a charlie horse (popular colloquial term in America at least for bad leg cramps/spasms. I mean the ones that cause your toes to arch towards the floor and the muscle to visibly twitch and tighten under the skin, and hurt really bad)? These thoughts were not going through my head when I woke up this morning with a horrible one in my left calf, as both the front and the back muscles were spasming. No, I was just thinking, "Ow, Ow, Ow, Ow." Now, now though, as I sit here and stretch gently, I found myself wondering. Google brought me this gem, Charley the horse. There is some records of a ground crew in Chicago in the 1880's who used a lame horse named Charley. When a player was injured, he would get jokingly called Charley the horse, or that there was a pitcher named Charles, nicknamed Old Hoss, who got a leg cramp running bases on day. I could not find multiple sources for this, so I don't actually know where the name came from for sure. I do know that it is often a sign of overuse, a need magnesium, potassium or calcium, or a sign of dehydration, among other things. I walked and stretched until it stopped cramping, and then grabbed a multivitamin and a couple potassium caplets before I left this morning for work. I have a feeling my potassium was low, so hopefully it eases. With mine, once I have one, I can actually feel the muscle twitching and stuff the rest of the day. I know if I stretched wrong, I could easily set off another. The other leg has that achy feel I get before I get one, so definitely need to up the vitamins or something. So what are these called for your? And what do you do to relieve them?