I have to say that renaming a horse is quite the chore, but I don’t agree too much with keeping it similar sounding. My Pinto Yearling came with the name Buttercup and she came when called that. She went from Buttercup to Khione (Key Own Knee) It was pretty easy for her to get accustomed to it…when ever I spoke to her I called her by her newly given name… It was always “Oh Khione, here is your supper…Oh Khione, look how soft you are…” whenever I said anything to her I included her new name…when I groomed her I sang her name to her “Oh Khione… khione, khione, your soft as velvet” in about a week she knew her name and I could begin calling her nicknames. She is KhiKhi… or Khi and she response to them.
One thing i will say…pick some names and then go scream them out into the pasture three times… pick the one that flows and she pricks her ears at.