Carsyn is a feminine respelling of Carson, a Scottish surname of uncertain origin that is usually explained as "son of Carr", Carr being an old word for a "marsh". The y spelling marks it as a girls' name, in the manner of Camryn and Karsyn. Carsyn ranked number 1830 in 2000, reached number 1100 in 2021 and stands at number 1380 in 2025.