交趾

Etymology
Traditionally said to have been a placename from the time of the sage-king Yao. In fact, an early form of the name seems to have been used by the native states for the area around the Red River delta prior to the Chinese conquest.

The  noted that the southern barbarians (Man) had crossed toes.

hypothesizes that the first syllable,, originated from the etymon *k.raːw, whence also.

Proper noun

 * 1)   Jiaozhi
 * 2)  Jiaozhi