District names in Isan in the 1910s

In several Isan provinces the districts were named in a common scheme, until they were renamed in 1913. There were districts named Udon (อุดร), Pachin (ปจิม), Thaksin (ทักษิณ) and Uthai (อุไทย), then followed by the name of the province. Only in case of Ubon Ratchathani the second part of the district name was just the short "Ubon" or Yasothon, which was part of Ubon Ratchathani then. These scheme was at least used in the provinces Sisaket, Ubon Ratchathani, Surin, Roi Et, Maha Sarakham and Kalasin.