He's been Robinette and Junior all his life. His son Beau is actually "Joseph Robinette 'Beau' Biden III (February 3, 1969 – May 30, 2015)". His 1/19 Delaware speech podium confirmed this.

Yeah I too was shocked in 1977 to find that Jimmy Carter was somebody named James Earl. At least Trump released his own long-form birth certificate, in 2011.

Even if the signing video follows the same motions it's still suss because you have not only the total change but also the blank-ish, unshown orders, plus a signing frequency that has already outstripped every prior WH occupant. No wonder he has trouble with his pens.

Link for sig: https://www.federalregister.gov/documents/2021/01/25/2021-01761/preventing-and-combating-discrimination-on-the-basis-of-gender-identity-or-sexual-orientation