The word 'corslet' was adopted as a so-called 'occupational surname,' later altered to Coslett, Cosslett, Coslet, etc., following the arrival of an expert in the manufacture of osmond iron, Corslet Tinkhaus, to Wales from his native Westphalia in 1567.
Palmer Cosslett Putnam (1900-1984) was an American consulting engineer and wind power pioneer, the son of George Haven Putnam and Emily (Smith) Putnam (1865-1944).