I used to ride a horse whose name used to be "Pooter." We eventually found out why while practicing for showmanship (he would fart as he passed the judge). His owners renamed him Wyatt.
My horse's registered name is Coyote Queen, and I get why. She is out of Coyote Cafe, and her grandsire on her dam's side is Seeking the Gold. She definitely thinks she is better than everyone else in her pasture, for sure. I have nicknamed her boyfriend, Zee Oh Six, "King" for a few years now, before I even knew that Queen existed.
We named Queen's 2024 colt Noble Thief. His sire is Shoplifted, by Into Mischief. I like to say that he steals your attention.
Other weird horse names I have known:
Monkeywitmybidness
Grass Snake (lovely little mare that is very very sweet, her barn name is Scarlett, and I think they officially changed her JC name to something else)
We also had an alcohol barn a couple years ago with:
Woody the Wino
Tony's Last Call
Amber in Ice
Magic Liquor
Moonshine Martini
I work at a Thoroughbred rescue.