Cydnee is of American origin, derived from the Greek name Cyrene, which means 'of the citadel' or 'fromCyprus'. It gained popularity as a female given name in the United States during the late 20th century, peaking in usage around the mid-1980s. Cydnee is often associated with the American actress and model Cyd Charisse, whose birth name was Tula Ellice Finklea.
"Cydnee experienced significant popularity from the mid-90s to late 90s with peaks of 43 births in 1995 and 51 births in 1997, but has since declined, reaching a low of 6 births both in 2018 and 2019. Overall, there have been 953 babies named Cydnee born between 1949 and 2022."