Translations:FAQ/149/en
From Gentoo Wiki
Here's a quote from Daniel Robbins (Daniel Robbins) : "I think the 'e' likely came from enoch, and was picked as a single-character prefix in the vein of the 'iMac', which was initially released in August 1998. Enoch began in early 1999. (see https://www.funtoo.org/Funtoo_Linux_History)."