Lewis & Short

2. Torquātus, i, m. [1. torquatus], the surname of T. Manlius, so called because he put on the neck-chain of a Gaul whom he slew in single combat; also, of his descendants, Quadrig. ap. Gell. 9, 13, 19; Cic. Fin. 1, 7, 23; id. Off. 3, 31, 112; Liv. 7, 10; Flor. 1, 13.
Adj.: Torquata nomina, Luc. 7, 584.
Hence, Torquātĭānus, a, um, of or belonging to a Torquatus, Torquatian: horti, Front. Aquaed. 5.