Great piece of history this is.

… Originally I used the abbreviation “invcel”. (My first article on the topic needed a DOS filename of 8 characters or less!) Someone else on the mailing list (the original forum) suggested that “incel” would be easier to pronounce, so we had switched by 1999.

Since the incel forums became exclusively male, and trended towards misogyny, the world has come to use the term “incel” to refer to men who are angry at women because they can’t find someone to date or have sex with. Reclaiming the term for the original neutral meaning would be a hopeless cause.