Scottish, northern Irish, or English: variant spelling of Ritchie 1. Perhaps also an altered spelling of Swiss German Rütsche, Rütschi, Ruetschi, from pet forms of the personal name Rudolf. .
The surname Ritchey was first found in Pertshire, former county in the present day Council Area of Perth and Kinross, located in central Scotland, where they held a family seat from the early times and their first records appear on the early census rolls taken by the early Kings of Scotland to determine the rate of taxation of their subjects.