What is the nickname for the confederate soilders?

Answer 1

The members of the Confederate military were often referred to as "rebels" or "Johnny Reb". Conversely, Union soldiers were called the "Yanks" or "Yankees". Yankees was a nickname that stuck with the USA, especially in WW 1.

Answer 2

Confederate soldiers called rebels by the North. They were also sometimes called greybacks (because of their grey uniforms), Johnny Reb, Johnny, or just plain Reb. Confederate guerrillas were also called bushwhackers.