Lanett is of American origin, derived from the Welsh given name Llenor, which means 'harmony' or 'serenity'. It gained popularity in the United States during the mid-20th century and is often associated with the Southern states.
The name Lanett experienced its most popular years between 1955 and 1962, with a peak of 7 births in both 1959 and 1962. However, after the late 1960s, there was a significant decrease in the number of babies named Lanett each year, reaching its lowest point in 1987 with only 5 births that year. Overall, between 1952 and 1987, the name Lanett was given to a total of 130 newborns.