lol, my geldings nick name is donkey, since its nicer than some of the other things I can call him when kids are around (no offense to donkey people of course, love the long ears, as well as cows!)
Other than that, I like the topic of names. I personally have always done well with horses named after small animals, like Mouse, Possum, Badger, Bug, etc. I have never gotten along with a horse named Star (not that they are bad, they and I just don't quite click). Just like I never had a good relationship with a guy whose name was Billy, or any version of that name. As a kid, I loved the name Charisma for a mare, I remember it was on that show "Hey Dude". I currently have a horse in my barn named Rebel that lived up to that with his owners, but is actually a big puppy dog. I also knew a bolter named Renegade, he had the name before the issue, go figure. They say that people that name their animals people names are more likely to treat the animals like people. Don't know about that one. Heck, I have cats named No No, Ya Ya, and Maybe. I think we just started running out of names. Now, I really don't care what the horse's name is, many of them just go by "dork" or "goober" or "mare".
I have always liked military-style names for male horses: Brigadier, Trooper, Scout, Soldier, General, etc. Funny how my male equids have not had any of these names! (Goose, Blackjack, Tom Terrific and Dusty. Dusty would have been Brigadier or Trooper if he hadn't already had his own name for 11 years...)
For females, not so sure. I had a paint pony mule I called Sassafras, or Sassy for short. I liked that a lot, especially since her coat was mostly the reddish-brown sassafras color.
My daughter rides a horse in her lessons named Trooper , I love him! She also rides a horse named Diamond
Some of my all time fave have been Liza, Freckles , Sunny, also Stormy and Frosty.
Our horses are named after the chac. on MASH Radar O'Reilly and Lt. Col. Henry Blake. My husband is a big fan of that show and since Radar was already named Radar(On the Radar) and Henry was (O'Henry) we just added to it.
I love the name Regalo. It means 'gift' in Italian. I like names that have a meaning to them, something different. I love my horse's name, even though it doesn't mean anything, his name is Aramis (nickname Arie for short).