Kasyn is a modern American spelling of Kason, which is itself a 21st-century creation: usually read as a blend of Kase or Cash with the -son ending of Mason and Jason, or as a respelling of the English surname Cason, "son of Cass". The y gives it the look of names like Jaxyn and Bryson. Kasyn has stayed between number 1586 and number 2069 every year since 2015, peaking in 2020, and ranks 1799 in 2025.