About the Detonnancour surname
The surname Detonnancour has a primarily toponymic formation. The structure of Detonnancour, with an article or preposition incorporated into the surname, is common in French names derived from a place, estate, landscape feature, or older nickname. The exact meaning depends on the earliest form in the family line. The surname may therefore originally have identified a person by place of origin, residence, or a feature of the landscape. Families bearing the same surname may nevertheless come from different places when more than one locality produced a similar name.
Pronunciation:
De-to-nan-kour/dətɔnɑ̃kuʁ/