Guan Yin - Bodhisattva as Goddess of Mercy

Where can I find the sanskrit or original version that mentioning Guan Yin is "Goddess of Mercy" as this wording popping up everywhere online. The word "God" really needs to be carefully written and respected. I understand many misconceptions from most famous Buddhism movie and one of the top 4 Novel of China which is Journey to The West. I am not sure the wording is from the movie or novel evolution? The movie script writing and Buddhism teaching way too much difference yet making people claimed himself as Buddhist more superstitious or dont even know who is Buddha or worship at temple of out nothing. Post ques remarks Seem the naming is from Christian and not Buddhism Sangha/community https://en.m.wikipedia.org/wiki/Jesuit_China_missions#:~:text=The%20missionary%20efforts%20and%20other,culture%20in%20Chinese%20society%20today .