Definition of "Humphrey"

I never saw but Humphrey, Duke of Gloster, / Did bear him like a noble gentleman.

1591 (date written), William Shakespeare, “The Second Part of Henry the Sixt, […]”, in Mr. William Shakespeares Comedies, Histories, & Tragedies. […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, (please specify the act number in uppercase Roman numerals, and the scene number in lowercase Roman numerals)

"Hump?" I asked. "Humphrey, really. But everybody callls him Hump. I know a lot of people who avoid calling him by his first name. For a long time people didn't think it was quite proper. But nowadays nobody seems to mind. What's happening to the power of words, Benny? Time was I used to blush at the words scrawled on the fences, and now I hear them - everywhere. How are writers going to write books if language is going bland on them?"

1988, Howard Engel, A Victim Must Be Found, page 70