'Phare' is certainly from Pharos, Pharus (nothing to do with pharaoh either. L. & S.:
Phărus or -os, i, f. (m., Suet. Claud. 20), = φαρος.
I. An island near Alexandria, in Egypt, where King Ptolemy Philadelphus built a famous light-house, hence called pharus, now Faro, Mel. 2, 7, 6; Auct. B. Alex. 19.—
B. Transf., of the lighthouse in the island of Pharos : Pharus est in insulā turris, magnā altitudine, mirificis operibus exstructa, quae nomen ab insulā accepit, Caes. B. C. 3, 112: superposuit turrem in exemplum Alexandrini Phari, Suet. Claud. 20; Juv. 6, 83; of other light-houses : pharon subiit, Val. Fl. 7, 84: turris phari terrae motu Capreis concidit, Suet. Tib. 74: Tyrrhena, Juv. 12, 76.—
C. Transf., poet., Egypt : regina Phari, Stat. S. 3, 2, 102: petimus Pharon arvaque Lagi, Luc. 8, 433.— Hence,
1. Phărĭăcus, a, um, adj., of or belonging to Pharus, Pharian, Egyptian (post-class.): sistra, App. M. 2, p. 127, 11.—
2. Phărĭus, a, um, adj., = φαριος, of or belonging to Pharus, Pharian; of the lighthouse : flammae, Luc. 9, 1004.— Poet., transf., Egyptian : Pharia juvenca, i. e. Io, Ov. F. 5, 619; but Isis, Mart. 10, 48, 1; nence, turba,the priests of Isis Tib. 1, 3, 32: conjux,Cleopatra Mart. 4, 11, 4: dolores,the lamentations of the Egyptian women at the festival of Isis for the lost Osiris Stat. S. 5, 3, 244: piscis,the crocodile Ov. A. A. 3, 270: acetum, Juv. 13, 85.—As subst. : Phărĭa, ae, f., Isis : SACRVM PHARIAE, Vet. Kalend. ap. Grut. 138.—
3. Phărītae, ārum, m., the inhabitants of Pharos, Auct. B. Alex. 19.—
II. A small island on the coast of Dalmatia, formerly called Paros ( Parus ), now Lesina, Mel. 2, 7, 13.