Swan Maiden
The swan maiden (svanejomfru) is a widespread European motif (ATU 400), attested in Danish (Svend Grundtvig), Swedish, and Icelandic collections. A man steals a swan woman's feather cloak, forcing marriage until she recovers it. In Nordic versions, she is often a huldra or elf-woman. The motif is documented but not a specifically 'Swedish' named being.