What is the real name of the Russian guard nicknamed Enzo?

The Russian guard nicknamed Enzo is Dmitri Antonov.

Dmitri is a prison guard at the Soviet facility in Kamchatka during Stranger Things season 4. He uses the name Enzo when communicating with Jim Hopper, and the nickname also connects to the restaurant in New York where Hopper had planned to meet Joyce before his apparent death.

Although Dmitri initially cooperates with the prison system, he accepts Hopper’s money and agrees to help him escape. His plan is exposed after Yuri Ismaylov betrays the arrangement, leaving Dmitri imprisoned alongside Hopper. The two men eventually work together during the prison escape and fight for survival against the Demogorgon.

Yuri Ismaylov is a separate character: he is the smuggler and pilot who betrays Joyce, Murray, Hopper, and Dmitri for profit. Grigori Stepanov is also unrelated to Enzo, appearing earlier as a Russian operative.