Why was the name Yuan unusual for a Chinese dynasty?

The name "Yuan" was considered unusual for a Chinese dynasty because it departed from long-standing naming traditions. Historically, Chinese dynasties were named after ancient feudal states or specific geographic locations; for example, the Liao dynasty was named for the Liao River, and the Jin dynasty took its name from a river in Manchuria.1

In contrast, "Yuan," which means "Great Origin," was a nongeographic name. When Kublai Khan adopted this title in 1271, it marked the first time a Chinese dynasty had used a nongeographic name since the Xin dynasty established by Wang Mang in the 1st century CE. This choice reflected a break from traditional Chinese naming conventions in favor of a term that carried a philosophical or symbolic meaning.1