I could not find anything about how or why this name change occurred.
Oei Ek Tjong (1921?-?)
He was born to a trader from Sulawesi and he was originally from Quanzhou, China. He would join his father in setting up shop in Makassar. Widjaja would leave school to work as a hawker and sold cookie and candy from his bicycle. Prior to the Japanese invasion of Indonesia, he would go on to work several odd jobs.
Eka Tjipta Widjaja (?-2019)
Widjaja would become one of the wealthiest men in Indonesia.
- “Eka Tjipta Widjaja & family”. Forbes.
- “Eka Tjipta Widjaja.” Wikipedia.
- Muhamad Al Azhari (27 January 2019). “Sinar Mas Founder Eka Tjipta Widjaja Passes Away; Here’s the Story of His Path to Fortune”. Jakarta Globe. Retrieved 16 July 2019.
- Studwell, Joe (2008). Asian Godfathers: Money and Power in Hong Kong and Southeast Asia. Grove/Atlantic, Inc. pp. 164–167, 255–256.
- Suryadinata, Leo (1995). Prominent Indonesian Chinese: Biographical Sketches. Singapore: Institute of Southeast Asian Studies. p. 222.
- “Widjaja Surname User-submission.” Forebears.
- “缅怀黄奕聪先生 (Remembering Mr. Huang Yicong)”. yicongfound.org. Retrieved 15 July 2019.