Vernola is specific to the Barese, Bari, Modugno and Molfetta, Vernoli, absolutely rare, present only in the north, should be the result of wrong transcriptions of the previous, which should derive from a nickname based on the Latin word vernula ( Servant, aide of the house), perhaps to indicate the craft of the ancestor.
Buy a heraldic document with your coat of arms
Verba Volant, Scripta Manent