Family Names

I'm in hopes some one can give me information as where to go find Imformation
on Family names before 1846
  My G.G. Grand mother (Augusta Johanna Justine Lang) was born in Hanover,
Germany March 8 1846 Would like to find her Birth records.
Lange's and others may have lived in or near Hesse, Darmstadt (Germany)
before 1846 Jacob Leinweber B 1700 Wife Katherine Hauser
             Heinrich "Henry" Christian Ludwig Lange, Sr. B January 28, 1833
       Frederick B. Kline, Sr. 1900 Census list him as being born in Baden
Would appreciat any HELP

Yours Truly,
Lois Peschel
Weatherford, Texas