Definition of "Davy"

Davy

/ˈdeɪvi/

proper noun
1. A diminutive of the male given name David.
  Quotations
  Tell him, I'll knock his leek about his pateUpon Saint Davy's day.
  1599, William Shakespeare, “The Life of Henry the Fift”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act IV, scene i]
2. A surname originating as a patronymic derived from David.
noun
plural Davies or Davys
1. A Davy lamp.
  Quotations
  […] the experience of more than one of the best-regulated collieries of the north of England, where a vast number of Davies are in daily use.
  1845, The Literary Gazette