The spelling of the word "Grevill" may seem confusing at first glance, but it is actually quite phonetic. The "g" is pronounced as a hard "g" sound, while the "r" is a rolled or trilled "r" sound. The "e" is pronounced as an "eh" sound, and the "v" is a voiced "v" sound. The "i" is pronounced as a long "ee" sound, and the final "ll" is pronounced as a double "l" sound. Therefore, the correct phonetic transcription for "Grevill" is /ˈɡrɛvɪl/.