1970, from the title of a Hindu chant or mantra, from Hindi hare "O God!" + Krishna, name of an incarnation of the god Vishnu.
Entries linking to hare krishna
Krishna
eighth avatar of Vishnu, 1793, from Sanskrit krshnah, literally "the Black One," from PIE *kers-no-, suffixed form of root *kers- "dark, dirty" (source also of Old Church Slavonic crunu, Russian coron, Serbo-Croatian crn, Czech cerny, Old Prussian kirsnan "black," Lithuanian keršas "black and white, variegated").