About Kurnool
The name Kurnool is derived from Kandanavooru or Kandanavolu. The name Kandanavolu is combination of Kandana and volu. Kandana means grease. During the days when Bullock Cart is a form of transport, bullock cart riders used to stop on the banks of Tungabhadra River to apply grease to the bullock cart wheels before crossing the river. Hence the name 'Kandanavolu'. Later the name formerly Kandanavolu changed to Kandanavooru, and then gradually to Kurnool.
Source : Wikipedia