• Several explanations have been posited regarding the origins of the name “梧槽”. The most widely accepted explanation is that it comes from the Malay term rocoh, which refers to the use of pointed wooden sticks to draw boundary lines on the ground. It is said that this was the common practice for marking boundaries before the colonial Government started using boundary stones.
• A second explanation is that it originated from the Mandarin term “五祖”, referring to “five ancestors” who first settled in the Rochor area.
• A third belief is that “五祖” referred to the founder of the anti-Qing organisation known as the Heaven and Earth Society. Its Singapore branch was founded by Ts’ao Ah Chih (also known as Chow Ah Chi or Cho Ah Chee), a member of the organisation who arrived in Singapore with Sir Stamford Raffles in 1819.
• Landmarks related to Rochor include Rochor River, Rochor Road and Rochor Canal Road.

To make way for the construction of the 21.5 km-long North-South Corridor, the four blocks of flats at Rochor Centre were acquired by the Government at the end of 2011. Most of the residents have already moved to the new replacement flats next to Kallang MRT Station. (Lianhe Zaobao, 27/6/2018)

According to oral history records, Ts’ao Ah Chih was the founder of the Cho Kah Koon and the Ning Yeung Wui Kuan. The former site of the Cho Kah Koon is located at the junction of Lavender Road and Kallang Road, on the north bank of Rochor River. The site was acquired by the Government in the 1970s and the association moved out in 1974.