I found in " Luxembourgeois dans le monde", Jean DUCAT:
H NEPPER Jacques, b. 1804 Habergy
W DEVILLET Marie, b. 1810 Habergy
c NEPPER Suzanna, b. 1832 Habergy
Immigration: 1833 OHIO
It is your family, I think.
I didn't find anything about their parents; the 18th century is not yet on the web
.
Good luck,