Hi... There are Rapps in my family ,,, My great grandfather Jens (John) Frostholm had a sister named Marie.SHe married a a William Rapp. I do not know if they were already married when they came to the states or if they married in NY after she immigrated to the USA from Denmark. She also had another brother Matthias. Does any of this sound familiar??? John lived in Syracuse ... and was a shoemaker.