"Eustashe" can be spelled phonetically as [juːstæʃ]. The first vowel sound is a long "u" sound followed by "st," and the final combination of "ashe" is pronounced as "ash." The name "Eustashe" is of English origin and is a variant of the name Eustace, meaning "fruitful" or "productive." This name was popular during medieval times and is still occasionally used today as a given name or surname. The correct spelling is important to ensure accurate pronunciation and avoid confusion.