The correct spelling of the surname "Orduno" follows the phonetic transcription /ɔrdʊˈnoʊ/. Starting with the open-mid back rounded vowel /ɔ/ sound, it is followed by the consonant cluster /rd/, the short mid central vowel /ʊ/, and the retroflex nasal /n/ sound. Finally, the word ends with the stressed long o /oʊ/ diphthong. The spelling of "Orduno" uniquely reflects the phonetic sounds of the word, making it easy to recognize and pronounce.