I know the group says it's Sea Foam, but I've also heard her as Sea Swirl and Dolphin Dreams. Celestia knows how many others names are circulating so what do you guys have to say? What do you think her real name is?

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Her canon name is Sea Swirl.

Its like the Minuette . Although that is the cannon name, but people still prefer to called her Colgate. Thus at the end of the day its up for the writer to choose which name he likes better. Be it Sea Swirl, Dolphin Dream or Sea Foam. Its all equal XD