Avallac'h's full name, Crevan Espane aep Caomhan Macha, is a traditional elven name in the Witcher universe. However, the specific meaning of his name is not explicitly explained in the Witcher books or the Netflix series. It's likely that each part of his name has a unique significance in the elven language or culture. Avallac'h is also known as 'The Mysterious Elf', which adds to the enigmatic nature of his character.