Guy is the French form of the Germanic name Wido, whose root is uncertain and is usually explained as "wood" or "wide". The Normans brought it to England, Guy Fawkes made it notorious, and in Hebrew it coincides with a separate name meaning "valley". Guy ranked number 801 in the United States in 2000, left the top 1000 shortly afterwards and ranks number 1637 in 2025 with 103 boys.