ECKHARDT, Harsum, Hanover, Germany

Looking for anyone else who may be related to Ferdinand ECKHARDT, who died in Harsum on April 10, 1775. He married Anna Maria FLOGEL in Hildesheim, Hanover, Germany on June 4, 1770.
They had two children before he died:
Maria Catharina ECKHARDT, a direct line ancestor to me, and her brother, Johann Friderich(Frederich)Ferdinand ECKHARDT.
Maria was born August 26, 1770 and Friderich was born September 20, 1775.
Their father, Ferdinand, was some kind of farm administrator for the nobility in Harsum.
Maria Catharina ECKHARDT married Johann Wilhelm ALGERMISSEN on May 12, 1795.It was her third marriage. Her first two hubbies died.
Any help would be appreciated.