Son of Carr
A modern feminine spelling of Carson, which originated as an English and Scottish surname meaning 'son of Carr'. The root 'Carr' likely refers to a marsh or swampy area, or potentially a person from a rocky place.
Less common today
Karsynn isn't in the latest US Top 1000. It last peaked at #4,290 in 2015.
US births per 5-year period, 1990βpresent (SSA data).