Wow, Princesse Antoinette, Baroness de Massy's granddaughter Mélanie Antoinette's full surname is Costello de Massy de Lusignan, indicating some connection with the medieval Lusignan Kings of Jerusalem and Cyprus! Turns out she is only named after her British-born ballet dancer and choreographer father Nikolai Vladimir Costello's (of Russophile Irish heritage?) nom de scène!