The spelling of the surname "Arseneau" is unique and requires careful attention to its pronunciation to understand its spelling. In IPA phonetic transcription, the pronunciation is [ɑrsəno]. Note that the "eau" ending is pronounced as /o/ in French, but in English, it is often pronounced as /oʊ/. Similarly, the "sene" is pronounced as /sən/ in English but in French, it is pronounced as /sɛn/. Therefore, when spelling "Arseneau," it is important to remember to replace the "eau" with an "o" and the "sene" with "sən."