"Debelak" is a surname with Slovenian origins, pronounced as "dɛbəlæk" in IPA phonetic transcription. The "d" is pronounced as a voiced alveolar stop, followed by an unstressed "ɛ" representing the short e sound. The letter "b" is pronounced as a voiced bilabial stop, followed by the unstressed "ə" for the schwa vowel. The final syllable begins with the letter "l", pronounced as a voiced alveolar lateral approximant, followed by the unstressed "æk" representing the short a sound. All in all, the correct spelling is determined by the sound of each letter when spoken.