mononymic

Etymology
From.

Adjective

 * 1) Pertaining to a mononym.
 * 2)  Having or known by a single name.
 * 3) * 2006, Jan Freeman, "Call him Saddam", Boston Globe, 17 November 2002:
 * A few newspapers use courtesy titles - Mr. Black, Mr. Hussein - except when they're stymied by a mononymic celeb like Cher or Eminem.