The Collaborative International Dictionary of English v.0.48:

Grayling \Gray"ling\, n. [From Gray, a.]
   1. (Zool.) A European fish (Thymallus vulgaris), allied to
      the trout, but having a very broad dorsal fin; -- called
      also umber. It inhabits cold mountain streams, and is
      valued as a game fish.
      [1913 Webster]

            And here and there a lusty trout,
            And here and there a grayling.        --Tennyson.
      [1913 Webster]

   2. (Zool.) An American fish of the genus Thymallus, having
      similar habits to the above; one species (T.
      Ontariensis), inhabits several streams in Michigan;
      another (T. montanus), is found in the Yellowstone
      region.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Upokororo \U`po*ko*ro"ro\, n. [From the native Maori name.]
   (Zool.)
   An edible fresh-water New Zealand fish (Prototroctes
   oxyrhynchus) of the family Haplochitonidae. In general
   appearance and habits, it resembles the northern lake
   whitefishes and trout. Called also grayling.
   [1913 Webster]

U.S. Gazetteer Places (2000):

Grayling, AK -- U.S. city in Alaska
   Population (2000):    194
   Housing Units (2000): 63
   Land area (2000):     10.930143 sq. miles (28.308939 sq. km)
   Water area (2000):    0.012854 sq. miles (0.033293 sq. km)
   Total area (2000):    10.942997 sq. miles (28.342232 sq. km)
   FIPS code:            30060
   Located within:       Alaska (AK), FIPS 02
   Location:             62.910472 N, 160.067250 W
   ZIP Codes (1990):     99590
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Grayling, AK
    Grayling


U.S. Gazetteer Places (2000):

Grayling, MI -- U.S. city in Michigan
   Population (2000):    1952
   Housing Units (2000): 895
   Land area (2000):     2.008115 sq. miles (5.200995 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    2.008115 sq. miles (5.200995 sq. km)
   FIPS code:            34640
   Located within:       Michigan (MI), FIPS 26
   Location:             44.663176 N, 84.710880 W
   ZIP Codes (1990):     49738
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Grayling, MI
    Grayling