What is "ananym"

real name written backwards, 1867, from Greek ana "back" (see ana-) + onyme "name" (see name (n.)).

n. (context obsolete English) A pseudonym derived by spelling one's name backwards; see anagram.

An ananym is a word whose spelling is derived by reversing the spelling of another word. It is therefore a special type of anagram. There is a long history of names being coined as ananyms of existing words or names for entities related to the thing named by the ananym.