The name Treg is of Cornish origin, derived from the Cornish words 'treg' meaning 'holy', and 'carant' meaning 'rock'. It was historically used as a surname, but it has been increasingly adopted as a given name in recent years. Treg is not widespread globally and maintains a unique association with Cornwall and its cultural heritage.
The name Treg has experienced fluctuations in popularity over the decades with a peak of 14 births in both 1970 and 1971. After this peak, there was a steady decline until the late 80s to mid-90s when the number of births started to increase again. The most recent data shows a consistent but lower number of Treg births from 2000 onwards, with a total of 297 births recorded between 1960 and 2016.