Abdiou

It is important to note that while Abdiou appears to occur as an uninflected name in 18:3 of Kings I (III) of the Septuagint, it is an inflected name in other parts of the Bible (such as 27:19 of Chronicles I). In those cases, Abdiou should be the genitive case of Ἀβδίας (Abdias), which thus means that at least in those cases, Abdias is the proper biblical Greek form of Obadiah:

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• Abdias (name): https://el.wiktionary.org/wiki/Ἀβδίας (in Greek)
• Abdiou (biblical character): https://el.wikipedia.org/wiki/Αβδιού (in Greek; mentions that other names are used for him in Greek, namely: Abdias, Obadias and Obdiou) [noted -ed]

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Also compare the genitive case of other hellenised Hebrew names that end in -ias, such as:

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• Ananias: https://en.wiktionary.org/wiki/Ἀνανίας#Inflection (in English)
• Elias: https://en.wiktionary.org/wiki/Ἠλίας#Inflection (in English)
• Ieremias: https://en.wiktionary.org/wiki/Ἰερεμίας#Inflection (in English)
• Zacharias: https://en.wiktionary.org/wiki/Ζαχαρίας#Inflection (in English)