Would later official documents reference the Ellis Island records or how were the official names determined eg when an immigrant was naturalized?
https://www.familysearch.org/en/wiki/United_States_Naturaliz...
> After 1906 an immigrant was required to submit a certificate of arrival when he petitioned for citizenship in order to prove the length of his residency. This document gives the place of entry, manner of arrival, and date of arrival. This was kept in the file with the petition.