Cathren is of Scottish origin, derived from the Gaelic 'Catrìona', which means 'pure'. It is a variant spelling of Catherine, itself derived from the Greek 'Katharína', meaning 'pure'. In Scotland, Cathren was popular in the Middle Ages and has since regained popularity in recent years. The name is often associated with Scottish culture and history.
"Cathren was quite popular as a baby girl name between 1916 and 1964, with peaks around the 1920s and again in the 1950s."