Royal ‘Roy’ Gardner is Anne Shirley’s college boyfriend/fiancé in Anne of the Island, by Lucy Maud Montgomery. Anne thinks Royal is her ‘ideal’, tall, dark, handsome, mysterious…I don’t care much for this name but I like it for a fictional character, especially in a historical fiction. And I like the vintage nickname Roy.
Royal Wilder was a relatively famous bearer of this name. He was Almanzo Wilder's brother, and as such showed up in Laura Ingalls Wilder's Little House books.