Pronunciation: [sɪˈɒnə͡ld] (IPA)
Correct spelling for the English word "Seonald" is [sɪˈɒnə͡ld], [sɪˈɒnəld], [s_ɪ__ˈɒ_n_əl_d] (IPA phonetic alphabet).
Correct spelling for Seonald