I love horses with interesting/unusual/funny names, so I though people could share the names of their horses or names that they'd heard of.
My horse's name is Shea, it's irish (pronunced shay) and means hawk/noble.
And a few I read about in a magazine:
A horse with three socks called Lost My Sock
A dun called The Dun Thing
A showjumper called Totally Naked (imagine what it sounded like when they announced them?)
Will add more later.