Demain Family History

English (Yorkshire and Lancashire): perhaps a variant of Main 4 or 5 with fused Old French preposition de ‘from’. Alternatively, the name may be a variant of Diamond. False association with the word demand would explain the shift of stress onto the second syllable, but the development to Demain, especially the change in the quality of the vowel, remains unexplained.

French: habitational name with fused preposition de ‘from’, denoting someone from Maing in Nord.

French: in some cases, possibly also a nickname from demain ‘tomorrow’.