I called my favourite childhood pony Baby Sparkle Gusty 'Bright Star' (got her when I was 7). About half my ponies had made-up names, the other half had their proper Hasbro names.
Actually my best friend in primary school and I made up a rhyme to remember the ballerina ponies' names:
Silky Slipper, Tip Toes,
Twinkle Dancer, Posey Rose!
My Posey Rose was called Cathy.