In 2018, 53 is the most common age for an American (U.S.) Guy who is registered male with the Social Security Administration. It is the 712th most common male first name for living U.S. citizens.
― Anonymous User 10/5/2018
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An alternative spelling used in France is Gui, and some French feminine forms are Guiote and Guyonne.
In France, Guy (GEE, with a hard g like the English pronunciation) can be a nickname for Guillaume, which is the French equivalent of William. So, in a way, it could be a French form of Bill or Will.