The Thai cat takes its name from Thailand (formerly Siam), the breed's country of origin. This naming reflects the breed's authentic heritage as the original type of Siamese cat before selective breeding in the West created the modern, extreme Siamese type. The name "Thai" was officially adopted when the breed gained recognition as distinct from the modern Siamese, emphasizing its status as the traditional, unaltered type from Thailand.
The breed has several widely recognized alternate names that reflect its history and relationship to the modern Siamese. "Traditional Siamese" is perhaps the most common alternate name, emphasizing that these cats represent the original Siamese type. "Old-Style Siamese" or "Classic Siamese" are also frequently used, distinguishing them from the contemporary extreme type. In some regions, they're called "Applehead Siamese" referencing their rounder head shape compared to the modern wedge-shaped head, though this term is considered less formal and sometimes viewed as derogatory by breed enthusiasts who prefer emphasizing authenticity rather than comparing to modern types.
Within Thailand itself, these cats are simply part of the natural cat population and may be referred to as "Wichien Maat" (วิเชียรมาศ), meaning "moon diamond" in Thai, a traditional name for pointed cats in their homeland. This name appears in ancient Thai cat manuscripts like the Tamra Maew (cat poems), where these cats were described and illustrated centuries ago. The Wichien Maat represents the authentic Thai cat type that has existed in the region for hundreds of years.
The breed's nomenclature has evolved through controversial history in cat fancy circles. When breeders in the West began selectively breeding Siamese for increasingly extreme features—longer, narrower heads, larger ears, and more tubular bodies—traditionalists became concerned that the original type was disappearing. In the 1990s and early 2000s, dedicated breeders began working to preserve the classic Siamese type, leading to establishment of separate breed recognition. The World Cat Federation (WCF) recognized the traditional type as "Thai" in 1990, providing the breed with distinct identity separate from the modern Siamese.
Other registries followed with varying approaches. The International Cat Association (TICA) initially called them "Thai" but later merged them back into the Siamese breed as the "Traditional" division. Some registries maintain separate recognition while others consider them variations of the same breed. This classification complexity means the same cat might be called Thai, Traditional Siamese, or simply Siamese depending on which registry and region you're referencing. Despite naming variations, the cats themselves remain consistent—representing the authentic, moderate type of pointed cat that originated in Thailand centuries ago and that existed before Western selective breeding created the modern extreme type.

