Correction: Apparently the Entailed Barons at Valdemars Castle spell their name Iuel-Brockdorff, though it's the same Juel as in Krag-Juel-Vind-Frijs. They both descend from 17th century Erik Juel, Councillor and Admiral of the Realm. The Iuel-Brockdorffs agnatically through his son the naval hero Admiral Niels Juel, the K-J-V-Fs cognatically through his younger son General Admiral Jens Juel, whose third wife, Dorothea Krag, was Christian Gyldenløve. Count of Samsø's, second wife and whose grandson married Griffenfeldt's granddaughter!
Hence the original Juel arms (d'azur, à trois fasces ondées d'argent, accompagnées en chef d'une étoile d'or) featuring in the inescutcheons of both families' arms.