Non-unique district names

Nowadays all the districts have unique names, with the notable exception of the five districts named Chaleom Phra Kiat, created in celebration of the 50th anniversary of HM the King ascension to the throne. There are a few more cases where only the English spelling is not unique, but the Thai spelling and pronunciation is different.

There are some interesting special cases in the history however.

• In Kanchanaburi Province the name Sangkhla Buri was originally given to the district Thong Pha Phum, but in 1939 the name was reassigned to the neighboring district.
• In Ubon Ratchathani Province the district Si Mueang Mai was originally named Khong Chiam, as it was the successor of the Mueang Khong Chiang. The historical location of that Mueang was split off as a minor district named Ban Dan in 1959. In 1971 the name Khong Chiam was reassigned to the newer district Ban Dan.
  
• Something similar must have happened in Chiang Rai Province, where the minor district Chiang Saen Luang was renamed to Chiang Saen in 1939, while at the same time the district formerly known as Chiang Saen became Mae Chan.
• In Narathiwat in 1939 the district Tomo was renamed to Waeng, and the name Tomo was given to the neighboring minor district Bacho (not to be confused with the Bacho in the north of Narathiwat, which is spelled differently in Thai).
  

There are also cases where a district name was later reused.

• The district Lamphun was located in Surat Thani Province, and was renamed to Ban Na and later Ban Na San. Not to be confused with Mueang Lamphun district, which has the additional word Mueang in its name. There is also the district Ban Na in Nakhon Nayok, I don't know yet when that one received its current name.
  
• In Trat Province, the district Laem Ngop was named Ko Chang till 1939. The present-day district was created in 1994.
• The district Si Songkhram in Nakhon Phanom Province was originally named Akat Amnui, which is now a new district in Sakon Nakhon Province.
• Ban Lat in Phetchaburi was named Tha Chang till 1939, the name is now given to a district in Saraburi
  

These are probably still not all the cases where a district name may be ambiguous when considering historical district names, when I find more later I will blog on those.