Pronunciation: [e͡ɪˈə͡ʊnə͡ʊ] (IPA)
Correct spelling for the English word "aiono" is [e͡ɪˈə͡ʊnə͡ʊ], [eɪˈəʊnəʊ], [eɪ_ˈəʊ_n_əʊ] (IPA phonetic alphabet).