Cognóminis, huius cognóminis, pen. cor. com. g. Plaut.That hath the same surname.Illa mea cognominis fuit.Plaut.She hath my surname.
Cognómino, cognóminas pen. cor. cognominâre. Plin. To giue a surname.
Lewis and Short: Latin dictionary
cognōmĭnis, e (abl. cognomine, v. the foll.; cf.: bimestris, coelestis al.), adj. [cognomen], like - named, of the same name (mostly poet. or in post-Aug. prose); with gen., dat., or absol.: duae germanae meretrices cognomines, Plaut. Bacch. 1, 1, 5: cognomine Insubribus pago Haeduorum, Liv. 5, 34, 9 Weissenb. ad loc.: flumen Absarrum cum castello cognomine, Plin. 6, 4, 4, 12: mox Asiacae cognomines flumini, id. 4, 12, 26, 82: eorum, id. 6, 2, 2, 5; Suet. Vit. 2: gaudet cognomine terrā, Verg. A. 6, 383 Forbig. ad loc. (Rib. terrae); Suet. Fragm. ap. Serv. ad Verg. A. 6, 383: cognominem patriae suae Salamina constituit, Vell. 1, 1, 1: sibi, Suet. Oth. 1.
cognōmĭno, āvi, ātum, 1, v. a. [id.]. I.To furnish with a surname, to surname, denominate (mostly post-Aug.; only once in Cic.): amaracum Phrygium, Plin. 21, 11, 39, 67; 21, 3, 7, 10; Quint. 4, 1, 2; Suet. Tib. 17.—In part. pass.: quo ex facto ipse posterique ejus Torquati sunt cognominati, Quadr. ap. Gell. 9, 13, 19; Suet. Aug. 7; Plin. 35, 10, 37, 112; 33, 10, 17, 133; Flor. 3, 5, 1: verba cognominata, i. e. synonyms, Cic. Part. Or. 15, 53.—II. Rarely in gen., to name, call: Macedonia... Emathia cognominata est, Just. 7, 1, 1; so id. 15, 2, 11; Gell. 2, 22, 8.