Definition of "Jazz"

Jazz

proper noun
1. A diminutive of the male given name James.
  Quotations
  His real name was James, but those who knew him seemed never to call him that. He was Jamesy, or more often Jazz.
  2001, Ian Rankin, Resurrection Men, Orion, page 4
2. A diminutive of the female given name Jasmine.
  Quotations
  "He calls you Jazzikins." He would. He had. Couldn't call me Jazz or Jasmine the way everyone else did.
  2012? Madeleine Oh, At Long Last, in The Mammoth Book of Erotica: Volume 4, Constable and Robinson Ltd (2012)