RE: My Little Pony: Friendship is Magic Clan-Clan: 20% cooler than...everything.
This is the best clan evar.
On the topic of pony names, I'm pretty sure:
Rarity- Likes to make expensive dresses, with rare gemstones and such, making them 'rare'.
Pinkie Pie- She is pink and bakes pastries and other sweets
Applejack- She farms apples, ???
Rainbow Dash- Hair is rainbow, can make a Sonic Rainboom (which is a rainbow), 'dash' means to go fast
Twilight Sparkle- ???, magic involves sparkles and such
Fluttershy- Has wings, thus can 'flutter', butterflies (which are on her Cutie mark) can 'flutter, she is very shy