False Etymology

A false etymology (pseudoetymology, paraetymology or paretymology), sometimes called folk etymology although this is also a technical term in linguistics, is a popularly held but false belief about the origins of specific words, often originating in "common-sense" assumptions.

Such etymologies often have the feel of urban legends, and can be much more colorful than the typical etymologies found in dictionaries, often involving stories of unusual practices in particular subcultures (e.g. Oxford students from non-noble families being forced to write sine nobilitate by their name, soon abbreviated to s.nob., hence the word snob). Many recent examples are "backronyms" (acronyms made up to explain a term), as in "snob", and "posh" for "port outward, starboard homeward"; many other sourced examples are listed in the article on backronyms.