Pinkey is of Indian origin, derived from the Sanskrit word 'Pingala', which means 'corpse'. It is traditionally used as a term for an outcaste person or someone of low caste in India. However, it has also been adopted by some families as a given name, independent of its historical context.
The name Pinkey seems to have had periods of popularity with several years seeing more than ten births each, particularly around the late 1800s and early 1900s, as well as a spike in the mid-1950s. However, it's clear that this name has never been extremely common, as there were many years where fewer than five babies were named Pinkey.