Etymology spam The original sense (canned ham) is a proprietary name registered by Geo. A. Hormel & Co. in U.S., 1937. It is presumed to be a conflation of either "spiced ham" or "shoulder of pork and ham"[1] but was soon extended to other kinds of canned meat. Hormel spells the trademarked name in all upper case.

The use for unsolicited and unwanted email derives from a Monty Python sketch (Flying Circus, Episode 25). In the 1970 sketch, a group of Vikings in a restaurant repeatedly chant the word "spam". The earliest recorded real-life use for this sense occurs around 1993 which finds reference in a newsgroup post dated March 31, 1993.

The term appears to have been used earlier in a different sense in relation to "Multi-User Dungeons" (MUDs), a kind of multi-user computer gaming environment before widespread use of the Internet, in the 1980s.