What I know through online research and a few family stories is that I have a Bernhardt Frederich Anton Schleicher in my family tree. He was listed on an 1860 census as a "Boot & Shoemaker". I saw someone here mention (Anna) Catherine Schlechtweg as his spouse. The census record also shows they lived in Roxbury at that time.
Their son Adam (possibly John Adam) was naturalized in NY, Oct. 1848. He went on to marry Henerette Schlacterway and had three girls, Amelia, Catherine, and Mary.
Catherine went on to marry my great great grandfather, Ernst Jasper Allendorf.
I'd love to get verification on this research myself, as well as finding out the names further back...Bernhardt and Anna Catherine's parents, and so on.