Modern invented name, likely meaning pure lake or waterfall.
Kaislyn is a contemporary American creation, likely formed by blending the prefix 'Kai' with the popular suffix 'lyn'. While its roots are modern, it draws from the Welsh 'lyn' meaning lake and the Scandinavian 'Kai' which can relate to the name Katherine, meaning pure.
Less common today
Kaislyn isn't in the latest US Top 1000. It last peaked at #4,770 in 2019.
US births per 5-year period, 1990βpresent (SSA data).