English
internym
From inter- + -nym.
Proto-Indo-European *ters- ‘dry’
Vulgar Latin *interrāre ‘to put in earth’
Old French enterrer ‘to bury’
Middle English enteren
English inter
The story
Coined by Madeleine Page in the Internet newsgroup alt.folklore.urban.
Today it means
noun A phrase or epithet, particularly one intended to be witty, inserted in quotation marks between one's first and last names—or elsewhere by or in one's name, if this is not possible—at the end of a post.
Language periods are conventional ranges, not dates for this word.
Etymograph / internym