A Perfect Day for Bananafish was created in 1948.

Some of the symbols in "A Perfect Day for Bananafish" include the bananafish themselves, which represent innocence and purity, as well as the hotel room, which symbolizes confinement and isolation. The ocean also serves as a symbol of freedom and escape from the pressures of society.

they were both written by the same person.

Muriel means materialism.

Sybil means a prophet.

that's all I know from other interpretations of names

"A Perfect Day for Bananafish" is a short story by J.D. Salinger and belongs to the genre of literary fiction. It is often categorized as a work of modernist fiction, focusing on themes of alienation, communication, and post-traumatic stress disorder.