Yuri Andropov
His earliest documented name was Grigory Vladimirovich Andropov-Fyodorov; he changed it to Yuri Andropov only several years later. While his original birth certificate disappeared, it was established that Andropov was in fact born in Moscow where his mother had been working in a women's gymnasium since 1913 throughout 1914 and until 1917.
Yuri Yappa
In 1949 he graduated from the Leningrad University, then continued postgraduate studies there at the Chair of Theoretical Physics headed by Vladimir Fock. Since then Yuri Yappa was the nearest collaborator of Vladimir Fock till the death of the latter in 1974.