Harmon De Mun Rosenkrans

I am looking to tie Harmon De Mun Rosenkrans to the Rosenkrans line.I have all the Rosenkrans genealogy since then, but I am missing 3 or 4 generations inbetween.

Harmon De Mun Rosenkrans was bork 1822 died 1903

Harmon Hendrik Rosenkrantz was said to have a son named Harmon, or Harmanus.My best guess is the name was passed over the generations to my Great Grandfather Harmon Darrin Rosenkrans, from De Mun.

ANY information would be greatly appreciated