Does anyone know the difference other than the obvious one of spelling between De Roo and De Reu? My mother's family was from Henry County/Rock County, IL and there were families with both spellings. The De Reu people seem to have orginated in East Flanders while the De Roo people seem to have orginated in West Flanders. A great great grandmother was Rosalie Louise De Reu, first husband-Marcelline Martens and second husbanDesire Coryn. Rosalie had brother, Peter De Reu who has descendants living today in western Illinois.