he was born in Krunicza, Prussia, Poland
possibly this place, Krynica: en.wikipedia.org/wiki/Krynica
have you checked the Ship's Record.
as well as checking the passenger it's always worth checking next of kin and the place name/address given for them.
edit. just realized that if he changed his name in the states you won't find him in Ship's Records
you'll have to check all the records for the particular ship and then match place of birth/origin
with date of birth.
check the name of the ship and date of departure. Elba or Elbe ?
the Elbe which sailed out of Bremen wasn't built until 1881