The spelling of the word "Theun" is relatively straightforward, as it is phonetically spelled exactly as it sounds. IPA phonetic transcription for "Theun" is θjuːn. The "th" sound at the beginning of the word is represented by θ in IPA. The "yoo" sound is represented by the combination of "ju" in IPA. Finally, the "n" sound is represented by "n" in IPA. Therefore, "Theun" is spelled as it sounds, making it an easy name to pronounce correctly.