What does the name Sibylle mean?

The meaning of the name “Sibylle” is: “Seer; oracle; prophetess”.

Additional information: This name derives from the Latin “Sibylla”, which in turn derives from the Greek “Síbulla (Σίβυλλα) Síbylla (Σίβυλλα), meaning “prophetess, sibyl”. The Sibyls were oracular women believed to possess prophetic powers in ancient Greece.  In later Christian theology, the sibyls were thought to have divine knowledge and were revered in much the same way as the Old Testament prophets.