The spelling of the word "Peulthai" can be best explained using IPA phonetic transcription. The first syllable "Peul" is pronounced as [pjuːl], where the "p" is followed by a "y" sound and a long "u" sound. The second syllable "thai" is pronounced as [θaɪ], where the "th" is an unvoiced dental fricative and the "ai" sounds like the word "eye". Overall, the spelling of "Peulthai" may seem uncommon, but using IPA phonetics can make understanding its pronunciation much clearer.