Jasper \j(a)-sper, jas-per\ as a boy's name is pronounced JAS-per. It is of Greek origin. Variant of Caspar or Gaspar. Also possibly (Persian) "treasure holder". Jasper is also a semiprecious gemstone, harder than glass, and red or reddish brown. Biblical: the jasper mentioned in the Book of Revelation actually may refer to a diamond. Painter Jasper Johns.
Jasper has 4 variant forms: Gaspar, Gasper, Jaspar and Jesper.
For more information, see also the related name Kaspar.