the Documentation Center of Cambodia maintains a biographic database containing 30,442 biographies. The search executed by the link above returns 400 of those names that have categorized as "victimized by".

Information from the DC-Cam website:

Since its inception, the Documentation Center of Cambodia (DC-Cam) has been at the forefront of documenting the myriad crimes and atrocities of the Khmer Rouge era. DC-Cam was founded after the U.S. Congress passed the Cambodian Genocide Justice Act in April 1994, which was signed into law by President Clinton. That legislation established the Office of Cambodian Genocide Investigations in the U.S. State Department’s Bureau of East Asian and Pacific Affairs in July 1994, which was charged with investigating the atrocities of the Khmer Rouge period (1975-1979).

Biographic Database

30,442 biographies are catalogued in this database. They are biographies of victims (ordinary citizens), KR commanders, cadres, soldiers, medical staff, messengers, militiamen, and other KR members, including those imprisoned and tortured in Tuol Sleng (S-21) prison.