The Romanized Britons adopted the Lion name, which amongst them became Llew, the Lot of the romances of the Round Table.  Here likewise figured the gallant Sir Lionel, from whom Edward III., in chivalrous mood, named his third son, the ancestor of the House of York... (History of Christian Names, Yonge, 1884)

    Lionel and Clarissa, an opera by Bickerstaff.  Sir John Flowerdale has a daughter named Clarissa, whose tutor is Lionel, an Oxford graduate.  Colonel Oldboy, his neighbour, has a son named Jessamy, a noodle and a fop; and a daughter, Diana.  A Proposal is made for Clarissa Flowerdale to marry Jessamy; but she despises the prig, and loves Lionel.  After a little embroglio, sir John gives his consent to this match.  Now for Diana: Harman, a guest of Oldboy's, tells him he is in love, but that the father of the lady will not consent to his marriage.  Oldboy advises him to elope, lends his carriage and horses, and writes a letter for Harman, which he is to send to the girl's father.  Harman follows this advice, and elopes with Diana; but Diana repents, returns home unmarried, and craves her father's forgiveness.  The old colonel yields, the lovers are united, and Oldboy says he likes Harman the better for his pluck and manliness. (The Reader's Handbook of Famous Names in Fiction, &c., Brewer, 1884)