Lewis & Short

2. Quintus, i, m., and Quinta, ae, f., Roman prænomen; the former usually abbreviated Q.: Quintus Arrius, Cic. Mil. 17, 46: Q. Scaevola, id. Phil. 8, 10, 31.
Quinta, Cic. Cael. 14, 34; id. Har. Resp. 13, 27; Liv. 29, 14, 12.