Lewis & Short

Serrānus (also Sarānus, e. g. SEX. ATILIVS M. F. SARANVS, Inscr. Orell. 3110; hence, to be derived from Saranum, an Umbrian city), i, m., a surname (agnomen) of C. Atilius Regulus, who was summoned from the plough to the consulship, Plin. 18, 3, 4, § 20; Val. Max. 4, 4, 5; Verg. A. 6, 844; Claud. in Ruf. 1, 202; id. IV. Cons. Hon. 414.
Of other Atilii, Cic. Sest. 33, 72; id. Planc. 5, 12; id. Q. Fr. 3, 8, 5 al.