The Collaborative International Dictionary of English v.0.48:

Mona \Mo"na\, n. [CF. Sp. & Pg. mona, fem. of mono a monkey,
   ape.] (Zool.)
   A small, handsome, long-tailed West American monkey
   (Cercopithecus mona). The body is dark olive, with a spot
   of white on the haunches.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Mona
    n 1: an island to the northwest of Wales [syn: Anglesey,
         Anglesey Island, Anglesea, Anglesea Island, Mona]

U.S. Gazetteer Places (2000):

Mona, UT -- U.S. town in Utah
   Population (2000):    850
   Housing Units (2000): 243
   Land area (2000):     1.384247 sq. miles (3.585182 sq. km)
   Water area (2000):    0.038009 sq. miles (0.098442 sq. km)
   Total area (2000):    1.422256 sq. miles (3.683624 sq. km)
   FIPS code:            51140
   Located within:       Utah (UT), FIPS 49
   Location:             39.815392 N, 111.856354 W
   ZIP Codes (1990):     84645
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Mona, UT
    Mona