Correct spelling for the English word "anonymal" is [ɐnˈɒnəmə͡l], [ɐnˈɒnəməl], [ɐ_n_ˈɒ_n_ə_m_əl] (IPA phonetic alphabet).
There doesn't seem to be any reliable source or recognized English word "anonymal" in the English language. It's possible that it may be a misspelling or a made-up word.