Lewis & Short

Dāvīd, m. indecl., or vīdis (gen. David, Aus. Ephem. 3, 84: Davidis, Juvenc. 1, 151; acc. -vīda, Juvenc. 2, 577: David, Vulg. 2 Reg. 23, 16), the second king of the Jews, and principal author of the Book of Psalms, Tert. adv. Jud. 9 et 12; Vulg. Ruth 4, 17 et saep.
Hence, Dāvīdĭcus, a, um, adj., of or belonging to David: urbs, Sedul. Carm. 4, 42: lyra, Cassiod. Var. 2, 20.