A maya snake deity that is closely related to a deity whose name means feathered serpent, is also closely related to what other deity?
Kukulkan: Kukulkan (/kuːkuːlˈkän/ ) (""Plumed Serpent"", ""Feathered Serpent"") is the name of a Maya snake deity that also serves to designate historical persons. Kukulkan:  Kukulkan is closely related to the deity Q'uq'umatz of the K'iche' people and to Quetzalcoatl of Aztec mythology. Quetzalcoatl: Quetzalcoatl ( ; ] ) (,    ) forms part of Mesoamerican literature and is a deity whose name comes from the Nahuatl language and means "feathered serpent".
Q'uq'umatz