nsledden, we are greatly interested on the other side of the pond about Sleddens, as pertains to the records of Sladens and Sladdens and possible connections. There is a Domesday entry for a thane named Slettan in Dunnington, York, and among many theories, an Old German word for hillside was sleyda and Old Norse for flat places is slatten. It is all rather airy-fairy since there are other theories about sloe berries and other vowel-shift possibilities, but we are trying to blend paper genealogy with genetics when possible whether we get to the root of the name(s) or not.
If you know of any interest in DNA to add to your paper-trail, please SEARCH on Slaton DNA, most engines will find our Family Tree Project.