guy (n.1)

"small rope, chain, wire," 1620s, nautical; earlier "leader" (mid-14c.), from Old French guie "a guide," also "a crane, derrick," from guier, from Frankish *witan "show the way" or a similar Germanic source, from Proto-Germanic *witanan "to look after, guard, ascribe to, reproach" (source also of German weisen "to show, point out," Old English witan "to reproach," wite "fine, penalty"), from PIE root *weid- "to see." Or from a related word in North Sea Germanic.

guy (n.2)

"fellow," 1847, American English; earlier, in British English (1836) "grotesquely or poorly dressed person," originally (1806) "effigy of Guy Fawkes," leader of the Gunpowder Plot to blow up British king and Parliament (Nov. 5, 1605). The effigies were paraded through the streets by children on the anniversary of the conspiracy. The male proper name is from French, related to Italian Guido.

updated on April 28, 2017

Definitions of guy from WordNet
guy (v.)
subject to laughter or ridicule;
Synonyms: ridicule / roast / blackguard / laugh at / jest at / rib / / poke fun
guy (v.)
steady or support with a guy wire or cable;
The Italians guyed the Tower of Pisa to prevent it from collapsing
guy (n.)
an informal term for a youth or man;
a nice guy
the guy's only doing it for some doll
Synonyms: cat / hombre / bozo / sod
guy (n.)
a cable, wire, or rope that is used to brace something (especially a tent);
Synonyms: guy cable / guy wire / guy rope
Guy (n.)
an effigy of Guy Fawkes that is burned on a bonfire on Guy Fawkes Day;
Etymologies are not definitions. From, not affiliated with etymonline.