Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Hĭbernĭa, ae, f. (= Ἰουερνία Ptol.), the island now called Ireland, Caes. B. G. 5, 13, 2; Plin. 4, 16, 30, § 103; Tac. Agr. 24.
Also called Iverna, ae, Mel. 3, 6, 6: Ju-verna, ae, Juv. 2, 160; and (acc. to the Gr. form Ἰέρνη Strab.) Ierna, ae, App. de Mundo, p. 60; and Iernē, ēs, Claud. Laud. Stil. 2, 251; IV. Cons. Hon. 33.
Jūverna or Jūberna, ae, f., Ireland, Mela, 3, 6, 6; Juv. 2, 160.