Sibyl is of Latin origin and means 'prophetess' or 'seer'. It was originally used as an agnomen, a nickname given to women believed to have prophetic powers. The name gained prominence during the Roman Empire, with figures like Sibylla Cumana, one of the ten sibyls in Greek mythology, associated with it.
The name Sibley shows varying popularity between 1918 and 1945, with peaks in 1920, 1922, 1925, and 1936, each having 8 births, and a significant spike in 1925 with 12 births. The years 1931, 1935, 1938, and 1945 also saw increased popularity, each with 5 births. Overall, there were 110 births of the name Sibley during this period.