Jeffrey \j(e)-ff-rey\ as a boy's name is pronounced JEF-ree. It is of Old German origin. Probably refers to "peace". Variant of Geoffrey. The three-syllable alternate spelling Jeffery (JEFF-er-ree) has been used since medieval times. Race-car driver Jeff Gordon.
Jeffrey has 24 variant forms: Geoff, Geoffrey, Geoffroi, Geoffroy, Geoffry, Geofrey, Geofry, Godfrey, Godfry, Gottfried, Jefery, Jeff, Jefferey, Jefferies, Jefferson, Jeffery, Jeffree, Jeffries, Jeffry, Jeffy, Jefry, Jeoffroi, Joffre and Joffrey.