The most common way of spelling (transliterating) Chiang Mai is just that, Chiang Mai. There are a couple of common ‘misspellings’ for it, and probably the most common is getting the i and a the wrong way around – Chaing Mai. Apart from that according to Google’s keywords search, an awful lot of people still search for Chiangmai and Changmai (all one word).
King Mengrai founded the city of Chiang Mai (meaning “new city”) in Northern Thailand in 1296. It is now the largest and most culturally significant city in northern Thailand, and is the capital of Chiang Mai Province. It is located some 700 km north of Bangkok, among some of the highest mountains in the country. The city stands on the Ping river, a major tributary of the Chao Phraya river.