Thank you for your detailed response! Is there any way to determine from the attached certificate of arrival that Elek is Jacob? My understanding is that during the naturalization process, someone would cross check the manifest. How would this person know to look for Elek (rather than Jacob).
I gather from your message that it is not likely that he could have changed his name (as there is little resemblance between Elek and Jacob). So then who is Elek and who are these other people he is traveling with!