An ID analytics study showed 40 million united states SSN had more than one name associated with them over a decade ago.
Whitepaper from LexisNexis, corporate background check company, explaining avout SSN not being a unique or even really reliable identifier
Idk dude, just googled "id analytics ssn" and I immediately get a page of results of articles from 2012-15. Could probably just add "as someone else" in scholar for the paper