The narrator in Toni Cade Bambara's short story, "Raymond's Run," is introduced to us by the nickname most of her friends and family call her. Her real name is Hazel Elizabeth Deborah Parker, which we find out at the May Day Race, but because of her squeaky voice, most people call her "Squeaky."
She says, "I much rather just knock you down and take my chances even if I am a little girl with skinny arms and a squeaky voice, which is how I got the name Squeaky."
The older kids call her "Mercury" because they all know she's the fastest kid on the block. This is an allusion to the Roman god, who was said to be very swift on his feet. Later in the story, Squeaky calls herself "Quicksilver" which is an alternate name for the element mercury.