Hello Kerry, My understanding is that the origin of the Dewsnap name to comes from a place name in the Parish of Cheadle in East Cheshire. The "knap" being an old form for hill and "dew" an old form for deer - hence dews knap or dewsnap. The first proper reference of the name is "Richard de Dewsnap" recorded in the Cheshire Hundred Rolls in 1273 and later in 1294 as "Richard de Duesnape" The Dewsnap name is appears to be limited in its distribution to mainly the Mottram/Glossop and Sheffield areas (with some exections). My own family originates from Sheffield but I have found a link back to Glossop in the mid 1700s. Notable Dewsnaps are:- Daniel Dewsnap, a miner from Oldham who helped the young Winston Churchill escape during the Boer War in South Africa in 1899, he was later given an inscribed pocket watch by Churchill, which was sold at auction in 1999 for, I think, £12000! - A Thomas Dewsnap became Master Cutler in Sheffield in 1823 I am not sure who or what the Dewsnap Lanes in Dukinfield and Mottram are named after, but I believe the old Dewsnap Sidings may have something to do with the former Dewsnap Mine nearby. I hope this is of interest to you and any other Dewsnaps!