Lewis & Short

Umbri, ōrum, m., a people of Italy, in the district of Umbria, which was named after them, Plin. 3, 5, 8, § 50; 3, 14, 19, § 112; Liv. 5, 35; 9, 37 sq.
Hence,

  1. A. Umber, bra, brum, adj., of or belonging to the Umbrians, Umbrian: porcus, Cat. 39, 11: aper, Hor. S. 2, 4, 40; Stat. S. 2, 4, 4; 4, 6, 10: villicus, Mart. 7, 31, 9: maritus, Ov. A. A. 3, 303.
    Substt.
    1. 1. Umber, bri, m. (sc. canis), an Umbrian dog used in hunting, Verg. A. 12, 753; Sen. Thyest. 497; Val. Fl. 6, 420; Sil. 3, 295; Grat. Cyn. 171 al.
      A kind of sheep in Spain and Corsica, Plin. 8, 49, 75, § 199.
    2. 2. Umbra, ae, f., a female Umbrian, in a pun with umbra, a shadow, Plaut. Most. 3, 2, 84.
  2. B. Um-brĭa, ae, f., a district of Italy so called, Plin. 3, 5, 8, § 51; Varr. R. R. 1, 50, 1; Cic. Rosc. Am. 16, 48; id. Mur. 20, 42; id. Div. 1, 41, 92.
    In apposition: Umbria terra, Gell. 3, 2, 6.
  3. C. Umbrĭcus, a, um, adj., of or belonging to Umbria, Umbrian: creta, Plin. 35, 17, 57, § 197.