Do more people say "grey" or "gray"?

Whether more people say grey or gray depends on region and dialect, as both spellings are correct and mean same color between black and white. Gray is American English spelling, preferred in United States, while grey is British English spelling, preferred in United Kingdom, Commonwealth countries like Canada, Australia, India, and Europe. Since US population is about 340 million and UK about 67 million, more people worldwide use American English due to US media influence, so gray is more commonly used globally in terms of total number of people, especially in internet searches and international business. However, grey is more common historically and in British-influenced regions including India where British spelling is taught. Google Ngram data shows gray more common in American books, grey more common in British books. In US, gray is standard in official documents, while grey appears as name. In everyday speech, pronunciation is same, so saying is identical, only writing differs. For technical contexts like HTML color codes, both spellings are recognized, but gray is standard code. In Crayola crayons, color is spelled with both versions depending on region. So answer, more people write gray if counting US plus international American English learners, but more countries use grey as official spelling. If you are in India where British English is taught, grey is more common in schools.