Before 1973 the summit was known as the NW summit of Ngga Pulu. The 1936 Carstensz Expedition called it the Second Peak of the North Wall. Heinrich Harrer labeled it Ngapalu on his map drawn in 1962, while calling the SE peak of Ngga Pulu Sunday Peak. Describing his ascent of both peaks in 1972, Dick Isherwood followed this nomenclature, using Ngga Poloe for what is now Sumantri and Sunday Peak for what is now known as Ngga Pulu.