Middle name starts in R ends in E, 5 letters, 2 vowels (not Y), & has Y. An austrian prince. A sir name. help?

I need to figure out this middle name. All I know is that it has 5 letters total, starts with R, ends with E, has two vowels BESIDES Y (yes, it has a Y AND the 2 vowels) and apparently this name was the name of an Austrian prince. It is a sir name? And it is a common name in relation to the developer of either helicopters or airplanes. HELP?! PLEASE AND THANKS. <3