Kwan-Yin may be the most well known god in Asia, besides Buddha.
However, there are many pronunciations and spellings for Kwan Yin. In Thailand, the western spelling and pronunciation is Kwan Yim. The English translation in China is Quan Ying.
As the Chinese saying goes, "Every household worships Buddha, while every family puts Kuan-Ying in their alter. Quan-Ying is known by two great names: Quan Shih-ying and Quan Tse-tsai as translated by two famous priests, Sou Mo Lou Shih, of the Yao-Chin Dynasty and Shuan-tsuang of the Great Tang Dynasty.
This god won people's belief because, even after reaching the Buddha status, she exercised great mercy by suffering and re-entering the human world to rescue ordinary humans. This is remembered as "Buddis-Satisva's answer to help calls" when she replies to human appeal.
It is believed Quan-ying was the princess of the Shingling State of nescient India around 2000 years ago. Her civilian name is Mao-Shan. Possessing much pity and mercy for people, she dedicated herself to worship and became Buddha status. She appeared to people in many forms of Quan-ying: Buddha, Fish-basket Quan-ying, Thousand-hand Quan-ying, etc. The most famous church of hers is at Pu-tou Mountain of the South China Sea. She was often spotted there. Japan, Korea, South East Asia, and Taiwan are the places possessing the strongest belief in Kwan-yin.