Hi there, and sorry for taking over a year (forgot all about this site). As far as I know the dayments are from south england originally. There seems to be a concentration of dayments in the north west states in america. I cant help you as far back as 1870 though! My grandparents were from devon and my great-grandad also was from there. Theres not too many dayments in britain either - still havent officially 'met' a dayment by chance that i wasnt related to (online aside).