Phetchaburi is a very old town and used to be an important royal for a along period of time. There were so many names by which to call this town in the old days, such as, Phripphri, Phripphli or Phetchaphli. Some historians have said that the name Phetchaburi could be the original name because it is found on Stone Scrip-true No.1.
It could have been named after the Indian style, according to Indian influence during those day, like some other towns in Thailand, such as, Ayothaya, Kanchanaburi, Suwannaphum. In addition, it is also believed that the name Phetchaburi might have originated from the Phetch River which is an important river of this town.