Pronunciation: [d͡ʒə͡ʊˈanjuː] (IPA)
Correct spelling for the English word "Joannue" is [d͡ʒə͡ʊˈanjuː], [dʒəʊˈanjuː], [dʒ_əʊ_ˈa_n_j_uː] (IPA phonetic alphabet).
Correct spelling for Joannue