Based on the provided source material, there is no information indicating that Chaiyo is a city in Thailand. The term "Chaiyo" is actually a Thai-language exclamation used to express joy or approval, serving as an equivalent to the English words "hurrah" or "hooray."
The expression is largely synonymous with "chayo," which is more frequently utilized in poetry. No geographical data regarding a city by this name exists in the source provided.