The Collaborative International Dictionary of English v.0.48:

Nash \Nash\ (n[a^]sh), a. [Etymol. uncertain.]
   Firm; stiff; hard; also, chilly. [Prov. Eng.] --Halliwell.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Nash
    n 1: United States writer noted for his droll epigrams
         (1902-1971) [syn: Nash, Ogden Nash]