Guy is used as an alternative term to refer to a man in a similar vein to the terms bloke, fellow, dude, chap and geezer. In the plural guys it may refer to a mixed or single sex group of men or women (this usage being most common in American popular culture). Guy is also used as a male given name (personal name).

The name came to prominence from that of Guido (Guy) Fawkes and grew in usage through the burning each year on 5 November of an effigy of him in the UK.

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Alternatives:

• As seen above, Guy (Guido, Gui) is a male proper name (as in Guy de Maupassant) and the origin of the name of Guyenne. However "Guyana" and "Guiana" come from an Amerindian word.

• A guy rope or guy wire is used to keep a mast, tent or other structure in place against the effects of wind.

• Guy was an R&B musical group.

• Guy is the former name of the Montreal metro station, Guy-Concordia