What is donald duck's middle name?

According to the cartoon Donald Gets Drafted (1942), Donald's full name is Donald Fauntleroy Duck (his middle name appears to be a reference to his sailor hat, which was a common accessory for Fauntleroy suits). Disney's website also states his name as Donald Fauntleroy Duck. Donald's birthday is officially recognized as June 9, 1934, the day his debut film was released, but in The Three Caballeros, his birthday is given as simply "Friday the 13th." In Donald's Happy Birthday (short) it has his birthday as the 13th of March.