Middle name? starts w/ R, ends in E, austrian prince, a sir name; 5 letters total, 2 vowels AND a Y. not rayne

Apparently this name may possibly be the developer of a helicopter or airplane company. It is a sir name, an austrian prince, has 5 letters total with 2 vowels AND the letter "Y" and it is NOT "rayne". PLEASE AND THANKS! <3