What is "xquic"

Xquic (or Ixquic, ALMG:Xkik', sometimes glossed as "Blood Moon" or "Blood Girl/Maiden" in English) is a mythological figure known from the 16th century Quiché (K'iche') Maya manuscript Popol Vuh. She was the daughter of one of the lords of Xibalba, called Cuchumaquic, Xibalba being the Maya Underworld. Noted particularly for being the mother of the Maya Hero Twins, Hunahpu and Xbalanque, she is sometimes considered to be the Maya goddess associated with the waning moon. However, there is no evidence for this in the Popol Vuh text itself.