Same entry, according to Adler, in the Ambrosian Lexicon (30).
Accented as it is (oxytone), nominative. The book of the prophet Obadiah in the Septuagint has the title ΑΒΔΙΟΥ and Ὅρασις Ἀβδιου "Obadiah's Vision"; the name has no accent, as a Hebrew name, so its case cannot be determined. Hesychius gives the name as oxytone, with the gloss ἑρμηνεύεται δοῦλος ἐξομολογητός "it is interpreted as acknowledged servant."