Casen is a modern American spelling of Cason, a name derived from the English surname Cason, which goes back to the given name Cass, and so read as "son of Cass"; its appeal lies mainly in the rhyme with Mason, Jason and Grayson. The spelling with an e gives it a slightly softer, Scandinavian look. Casen entered the US top 1000 in 2009, peaked at number 611 in 2014 and ranks number 842 among boys in 2025.