Lewis & Short

Tyrrhēni, ōrum, m., = Τυρρηνοί, the Tyrrhenians, a Pelasgian people who migrated to Italy and formed the parent stock of the Etrurians, Verg. A. 11, 171; 11, 733; Plin. 3, 5, 8, § 50.
Hence,

  1. A. Tyrrhē-nus, a, um, adj., of or belonging to the Tyrrhenians or Etrurians, Tyrrhenian, Etrurian, Tuscan: mare, Mel. 1, 3, 3; Plin. 3, 5, 10, § 75; Hor. C. 1, 11, 6; 3, 24, 4: aequor, id. ib. 4, 15, 3; Verg. A. 1, 67.
    Also personified: Tyrrhēnus, i, m., the Tuscan Sea, Val. Fl. 4, 715: flumen, i. e. the Tiber, Verg. A. 7, 663: orae, id. ib. 7, 647: gens, Ov. M. 3, 576: rex, Verg. A. 8, 555: regum progenies, Hor. C. 3, 29, 1: parens, id. ib. 3, 10, 12: corpora, i. e. of Tyrrhenians, Ov. M. 4, 23: sigilla, Hor. Ep. 2, 2, 180.
    Poet., for Italian: pubes, Sil. 1, 111.
  2. B. Tyr-rhēnĭa, ae, f., the country of the Tyrrhenians, Tyrrhenia, Etruria, Ov. M. 14, 452.
  3. C. Tyrrhēnĭcus, a, um, adj., of or belonging to the Tyrrhenians or Etruscans, Tyrrhenian, Etrurian: Tarraco, situated on the Tuscan Sea, Aus. Ep. 24, 88; Suet. Claud. 42.