Ok in all seriousness:
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loginThis is the pose that looks most like a "walking" pose to me.
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loginThese poses look to me like some one gesturing or posing because of enthusiasm, especially the Pinkie one. I could definitely see the "Can Can" name taking off just because it's fun, descriptive, and won't be confused with other poses. More mundanly, it could be called the "pointing pose." But that might get mixed up with this pose:
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loginThis one has had lots of fun suggestions, but in actual regular conversation it would need a simpler one or two word name. Something like "the Gasp pose". I could also see the "Darling pose" that someone suggested. Both the pose and the word are very "Rarity." Ha! maybe it could be the "IDEA!" pose.
Some poses are definitely going to have to have added descriptors though. As Tornado Twist pointed out, there is a pegasus variant, legs switch sides, and the heads can be traded out so you could end up with unicorn variants and open/closed mouth variants.