What is Donald Duck's middle name?

Donald Duck’s middle name is Fauntleroy. His full name is Donald Fauntleroy Duck, a detail that appears in Disney-related character material and has become part of his established identity.

“Fauntleroy” is also associated with Donald’s sailor outfit. The name recalls Little Lord Fauntleroy, the title character of Frances Hodgson Burnett’s 1886 children’s novel, whose formal costume included a distinctive sailor-style suit. Donald’s clothing is not identical, but the connection helps explain why the unusual middle name fits his visual design.

Donald’s full name is most often used for comic emphasis rather than in ordinary stories. The character is usually simply called Donald Duck, while his nephews Huey, Dewey and Louie, his girlfriend Daisy Duck and his uncle Scrooge McDuck are identified by their familiar short names.

The middle name should not be confused with Donald’s official birthday, June 9, 1934, or with the name of his voice actor, Clarence Nash. Fauntleroy identifies Donald himself and is the single canonical answer to the question.