Jett is an English word name that evokes both the glossy black gemstone and the "jet" plane; the word itself comes from the Greek gagates, a stone from the town of Gagai. Actor John Travolta named his son Jett in 1992, which introduced it as a given name. Jett ranked 644th in the United States in 2000 and has climbed steadily over the past decade, from number 329 in 2015 to a peak of number 161 in 2024 and number 169 in 2025.