Stratis Myrivilis' name is actually Efstratios Stamatopoulos. Stratis Myrivilis is a pseudonym. Stratis Myrivilis is actually the name of the character in his book "Life in the Tomb." But since this is one of his major works and the character in this story is very similar to Efstratios Stamatopoulos, he is referred to with this name.
Although Life in the Tomb is really about his life, for some reason the author decided to write it as a fiction. He based the story around the imaginary character Stratis.