Quetzalcoatl was a deity in Aztec and other mesoamerican cultures. Quetzalcoatl is depicted as a feathered serpent, sometimes with anthropomorphic forms.
The name Quetzalcoatl derives from the Nahuatl (Aztec) language and literally means "feathered serpent". He was considered the god of wisdom and wind.
The correct pronunciation of Quetzalcoatl is KET-sahl-KOH-ah-tul. The "ue" in Quetzalcoatl is pronounced as an "e" with a closed sound. It is preceded by the "Q" which is pronounced simply as a "K". The stress in Quetzalcoatl is posed on both the first and third syllable. However, it is important to stress the third one particularly, as it changes the complexion of the word. In this case, the third syllable has been transcribed as -KOH. The way it is pronounced makes it sound as if it were a single syllable, with the sound rolling off together as if both parts were stressed. The final part, "tl", has been transcribed as -tul, but the "u" sound should be nearly imperceptible and you should try to pronounce the "T" and the "L" in sequence.