Geek etymology in English

Etymology Blog

English word geek comes from British English dialect word geck (fool) which in turn derives from Middle Low German geck (fool, freak)

Dictionary entry	Language	Definition
geck	English (en)	(archaic, pejorative) Fool; idiot; imbecile. Scorn; derision; contempt (ambitransitive) To jeer; to show contempt for.. To cheat or trick.
geek	English (en)	(colloquial) A person who is intensely interested in a particular field or hobby and often having limited or nonstandard social skills. Often used with an attributive noun.. (colloquial) An unfashionable or socially undesirable person.. (colloquial) The subculture of geeks; an esoteric subject of interest that is marginal to the social mainstream; the philosophy, events, and physical [...]
geck	(gml)	Fool, freak

Geek etymology