Laos

The Lao people (ຄົນລາວ) have lived in the middle Mekong valley since at least the 8th century CE, when Tai-Kadai-speaking groups migrated south from what is now Yunnan province in China. Chinese Han dynasty records from the 2nd century BCE mention a polity called Ailao (哀牢) in the borderlands of Yunnan, and historians have long discussed whether this is an early form of the same name. The Lao word Lao (ລາວ) is a self-designation without a documented lexical meaning; it simply names the people of that valley. In their own language the country is called Muang Lao, meaning the Lao lands.

The Kingdom of Lan Xang, the Land of a Million Elephants, was founded in 1353 CE by Fa Ngum, a Lao prince who unified the upper Mekong principalities with Khmer military backing. Lan Xang lasted nearly four centuries as one of the most powerful states in mainland Southeast Asia, controlling trade routes between China, Vietnam, and the Thai kingdoms. In 1707 the kingdom fractured into three rival principalities: Luang Prabang, Vientiane, and Champasak. By 1779 the Siamese kingdom of Thonburi had made all three tributary states, and the name Lao referred more to a culture and language than to any single political entity.

French colonial administrators arrived in 1893, concluding the Franco-Siamese Treaty that transferred the left bank of the Mekong to French Indochina. The French needed an official name for their new protectorate, and French administrative convention often added a silent s to foreign place-names to form a collective noun. Laos was the result: a French bureaucratic construction that the Lao people themselves never used. In Lao the country remained simply Lao; the s belonged to the filing cabinets of Hanoi and Paris.

Laos gained independence in 1953 and full sovereignty under the 1954 Geneva Accords. The French spelling Laos remained the international standard, and the Lao People's Democratic Republic, established in 1975, officially uses Lao PDR in its own English documents, conspicuously dropping the s. In English the word is pronounced both laoss and laow, neither matching the Lao original, which is a single open vowel. That silent letter, added by a French bureaucrat in 1893, is still there on every map.