邓恩 is the standard rendering for actors and athletes named Dunn or Dunne, and for the metaphysical poet John Donne (often 约翰·邓恩). Context (sport, film, literature) tells you which Dunn.
memory
邓 is also the surname of Deng Xiaoping (邓小平), one of China's most familiar surnames - a handy hook for the 'Dun-' sound. 恩 (kindness) is a standard '-en/-on' phonetic in foreign names.
