Definition of "Lionel"

His grandfather was Lionel, Duke of Clarence, / Third son to the third Edward, King of England. / Spring crestless yeomen from so deep a root?

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

"Yes. You see, I was born under the sign of Leo, though it's not my real name.""What is your real name?"I saw Marcus looking at me, but I couldn't refuse to tell her."It's Lionel. But don't tell anyone.""Why not?""Because it's rather a fancy name."

1953, L. P. Hartley, The Go-Between, Hamish Hamilton, published 1974, pages 49–50