Ser-jay is how you pronounce Sergei
Sergei is pronounced as "ser-GAY" with the emphasis on the second syllable.
Sergei (ser-gay) [short g]Prokofiev (pro-koh-fee-evv)
Sergei Sage's birth name is Sergei Luzginov.
Sergei Chigrakov's birth name is Sergei Chigrakov.
Sergei Debizhev's birth name is Debizhev, Sergei Gennadyevich.
Sergei Chekan's birth name is Chekan, Sergei Stanislavovich.
Sergei Rachmaninoff's birth name is Sergei Vasilyevich Rachmaninov.
Sergei Kozlovsky's birth name is Kozlovsky, Sergei Vasilyevich.
Sergei Krupennikov's birth name is Sergei Ivanovitch Krupennikov.
Sergei Krikalev's birth name is Krikalev, Sergei Konstantinovich.
Sergei Kudimov's birth name is Sergei Vladimirovitch Kudimov.
Sergei Kurilov's birth name is Kurilov, Sergei Ivanovich.
Sergei Kuryokhin's birth name is Kuryokhin, Sergei Anatolyevich.