professionym

noun2

1. •
   A term, title, or form of address used to designate or identify a person or group by their profession.
2. •
   A surname or proper name derived from the occupation of the initial bearer; an occupational surname.

   • The third largest group of surnames is formed by professionyms (e.g. Kovář ‘smith’, Kolář ‘wheeler’, Mlynář ‘miller’), which make up about 12% of the total number of surnames. — 2016