The spelling of the surname "Devillier" can be described using IPA phonetic transcription. The first syllable "Dev" is pronounced as "dɛv", with a short "e" sound followed by a "v". The second syllable "il" is pronounced as "il", with a short "i" sound followed by an "l" sound. The last two letters "lier" are pronounced as "lije", with a long "i" sound followed by a "j" sound and a silent "e". Together, the pronunciation of "Devillier" is "dɛv.il.lije".