The Leather surname is not related to working in the Leather industry. In the records of the Leather Family History Society, very few Leathers have worked in that industry. Besides, there are patronymics for specific jobs within that industry, such as Tanner, Saddler, and Shoemaker.
The Leather name may originate from Litherland/Litherpool (later Liverpool), an area in north-west England. Leathers have always been concentrated on the Lancashire/Cheshire border (and remain so today) in such places as Leigh, Liverpool, Bolton, Warrington, St Helens, Wigan, and Northwich, with smaller groupings in London, Birmingham and the West Riding of Yorkshire.
If you are interested in finding out more about the many Leather families, contact the Leather Family History Society at firstname.lastname@example.org