[jarek]

"Adolph Schuep" and "Adolph Schüp" are the same name, Schuep just has Schüp re-spelled without the umlaut.

Schopf, Schiep, and Scheip are likely just phonetic respellings/typos.

Not only were people back in the day not that particular about exactly how a foreigner's name was spelled, often times people wouldn't be sure or would change how their own name is spelled.