Originally, the area was
Khwaeng San Thia (แขวงสันเทียะ).
San Thia is
Khmer, meaning 'a place to gather salt'. The name refers to the tradition of salt production in the area. In 1900,
Khwaeng San Thia was changed to a district and renamed
Non Lao. The following year it was named
San Thia. In 1919, the district name was changed to
Non Lao again. Finally in the phase of
Thai nationalism under Field Marshal
Plaek Phibunsongkhram, the district name was changed to
Non Thai in 1939 to remove the reference to the
Lao population in the name. ==Geography==