The Collaborative International Dictionary of English v.0.48:

Marlin \Mar"lin\, n. (Zool.)
   The American great marbled godwit (Limosa fedoa). Applied
   also to the red-breasted godwit (Limosa haematica).
   [1913 Webster]

   2. [from marlin spike, the shape of its bill.] Any of several
      marine billfishes of the genera Makaira and
      Tetrapturus, popular as game in sport fishing.
      [PJC]

   Hook-billed marlin, a curlew.
      [1913 Webster]

WordNet (r) 3.0 (2006):

marlin
    n 1: large long-jawed oceanic sport fishes; related to
         sailfishes and spearfishes; not completely cold-blooded
         i.e. able to warm their brains and eyes

U.S. Gazetteer Places (2000):

Marlin, PA -- U.S. Census Designated Place in Pennsylvania
   Population (2000):    640
   Housing Units (2000): 278
   Land area (2000):     0.900822 sq. miles (2.333117 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.900822 sq. miles (2.333117 sq. km)
   FIPS code:            47600
   Located within:       Pennsylvania (PA), FIPS 42
   Location:             40.680503 N, 76.244204 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Marlin, PA
    Marlin


U.S. Gazetteer Places (2000):

Marlin, TX -- U.S. city in Texas
   Population (2000):    6628
   Housing Units (2000): 2826
   Land area (2000):     4.523077 sq. miles (11.714714 sq. km)
   Water area (2000):    0.051266 sq. miles (0.132779 sq. km)
   Total area (2000):    4.574343 sq. miles (11.847493 sq. km)
   FIPS code:            46740
   Located within:       Texas (TX), FIPS 48
   Location:             31.307975 N, 96.892975 W
   ZIP Codes (1990):     76661
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Marlin, TX
    Marlin