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.
Walter Allen Coslet (born in Lewistown, Montana on October 31, 1922, died in Helena, Montana on November 29, 1996) was a well known science fiction fan, collector, and fanzine publisher as well as a charter member of the International Society of Bible Collectors, writing many articles for the society's publications.