Board Thread:General Discussion/@comment-27079851-20160822120151/@comment-1916997-20160822163131

Swan is the last name of the family that fostered/adopted Emma when she was a baby, and kept her for several years, until they had their own child, and put Emma back into the system. That's all we know so far. Obviously, from an outside perspective, the name was choosen to allude to The Ugly Duckling, as you mentioned. Also, a swan is most often depicted as a white bird, and white is associated with purity, again alluding to the fact that Emma is The Savior and a product of true love.