mononymic

From mononym +‎ -ic.

mononymic (comparative more mononymic, superlative most mononymic)

1. Pertaining to a mononym.
2. (not comparable) Having or known by a single name.
   • 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.

• (having or known by a single name): mononymous, uninymic

• monomycin