Do not know origin of Dace name. To through some more sand into the works. My grandfathers brother spelled his last name Dace and ours was spelled Days. I also had some ancestors that spelled it both ways. One time spelling it Dace and the next Days. Have heard it spelled both ways. Also have been told it was originally spelled Dooce with a ** above one of the "o"s. This should add to the confusion.