I am a daughter of a Heiman, doing some geneology research. I found this information on this website:
Mary Katharina Heimann (born Dreyer), 1825 - 1913
Mary Katharina Heimann (born Dreyer) was born on month day 1825, at birth place.
Mary married Bernard Heimann in 1847, at age 21 at marriage place, Texas.
Bernard was born on November 10 1819, in Vorhelm, Westphalia, Germany.
They had 2 daughters: Anna Gottschalk (born Heimann) and one other child.
Mary passed away on month day 1913, at age 87 at death place, Texas.https://www.myheritage.com/names/mary_dreyer
If you have any info I would appreciate it!