The meaning of "Kirirom" is "Happy Mountain". This name was given to the area by King Monivong in the 1930s. The ancient name of the place was Phnom Vorvong Sorvong for the main two hills there were connected with the Cambodian popular legend about two heroic princely brothers, Vorvong and Sorvong.
Kirirom is now a popular recreation site. Within driving distance of Phnom Penh, on weekends a significant number of people travel to the park. Many vendors sell various types of food, though some visitors prefer to bring picnic lunches.