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]

U.S. Gazetteer Counties (2000):

Nash -- U.S. County in North Carolina
   Population (2000):    87420
   Housing Units (2000): 37051
   Land area (2000):     540.268598 sq. miles (1399.289186 sq. km)
   Water area (2000):    2.424061 sq. miles (6.278289 sq. km)
   Total area (2000):    542.692659 sq. miles (1405.567475 sq. km)
   Located within:       North Carolina (NC), FIPS 37
   Location:             35.952773 N, 77.927170 W
   Headwords:
    Nash
    Nash, NC
    Nash County
    Nash County, NC


U.S. Gazetteer Places (2000):

Nash, OK -- U.S. town in Oklahoma
   Population (2000):    224
   Housing Units (2000): 128
   Land area (2000):     0.321234 sq. miles (0.831991 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.321234 sq. miles (0.831991 sq. km)
   FIPS code:            50300
   Located within:       Oklahoma (OK), FIPS 40
   Location:             36.664892 N, 98.052487 W
   ZIP Codes (1990):     73761
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Nash, OK
    Nash


U.S. Gazetteer Places (2000):

Nash, TX -- U.S. city in Texas
   Population (2000):    2169
   Housing Units (2000): 1003
   Land area (2000):     2.822632 sq. miles (7.310582 sq. km)
   Water area (2000):    0.011529 sq. miles (0.029859 sq. km)
   Total area (2000):    2.834161 sq. miles (7.340441 sq. km)
   FIPS code:            50352
   Located within:       Texas (TX), FIPS 48
   Location:             33.441774 N, 94.125315 W
   ZIP Codes (1990):     75569
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Nash, TX
    Nash