The Collaborative International Dictionary of English v.0.48:

Bertha \Ber"tha\, n. [F. berthe, fr. Berthe, a woman's name.]
   A kind of collar or cape worn by ladies.
   [1913 Webster]

   Big Bertha, n. a large cannon used by the German army
      during World War I.
      [PJC]
      [1913 Webster]

U.S. Gazetteer Places (2000):

Bertha, MN -- U.S. city in Minnesota
   Population (2000):    470
   Housing Units (2000): 228
   Land area (2000):     1.025719 sq. miles (2.656600 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    1.025719 sq. miles (2.656600 sq. km)
   FIPS code:            05482
   Located within:       Minnesota (MN), FIPS 27
   Location:             46.267377 N, 95.063868 W
   ZIP Codes (1990):     56437
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Bertha, MN
    Bertha