Achilles, upon whom Pyrrha is based, is said to have disguised himself as a red-haired girl, assuming the name Pyrrha upon doing so.
Hua Mulan, upon whom Lie Ren may be based, disguised herself as a man in order to serve in the army in place of her aging father.
JNPR (Juniper berries, blue) is a possible allusion to Rooster Teeth's other series, Red vs. Blue, when compared to their rival Team RWBY (Ruby, red gemstone).
Juniper bushes are also known to turn bright yellow, which helps to explain its connection to leader Jaune (as with Ruby to RWBY, Cardin to CRDL, and Coco to CFVY).
Team JNPR's members' fighting styles are based on archetypal warriors from a different culture: Jaune's is Frankish/Norman, Pyrrha's is Greco-Roman, Ren's is East Asian, and Nora's is Nordic.
On November 6th, 2014, Monty Oum discovered that he was allergic to juniper.
On The Staff Of Charon during Red Vs Blue Season 13 Episode 6, Team JNPR is one of the names scrolling on Hargrove's screen, along with RWBY.
Following Volume 3, the team has been referred to as Team JNR in merchandise and in DLC packs for RWBY: Grimm Eclipse. The title is presumably the internal name for the group and has been adapted by the fandom as the group's unofficial title, but has yet to be used in canon.