Agnomen
A New Law Dictionary and Glossary · Alexander M. Burrill · 1850
A New Law Dictionary and Glossary
Lat. In the Roman law. The last of the four names used among the Romans; the other three being the prcenomen, the nomen, and the cognomen; a name assumed or added from some particular circumstance; a surname.
Inst. 2. 20. 29.
Cooper^ s Notes, in loco.