Karstin is of Scandinavian origin, derived from the Old Norse word 'karstinn', which means 'strong'. It is a variant spelling of the more common name Carlston. Karstin is also associated with the Old German name Carlstein, meaning 'free man' and 'stone'. This name is relatively rare, but it has been used in Sweden and other Scandinavian countries. The name Karstin is often shortened to Karst or Stein.
The name Karstin first appeared in records in the year 2010 with a total of five babies born that year.