The word mogwai is the transliteration of the Cantonese word 魔怪 (mo1 gwai2) (Mandarin Chinese: 魔鬼; pinyin:móguǐ) meaning "ghost", "evil spirit", "devil" or "demon".
According to Chinese tradition, mogwai are certain demons, which often inflict harm on humans. They are said to reproduce sexually during mating seasons triggered by the coming of rain. Supposedly, they take care to breed at these times because rain signifies rich and full times ahead.