Cayson is a modern American spelling of Cason, a name that grew out of the English surname Cason, itself from the given name Cass, and that owes its popularity to the rhyme with Mason, Jason and Grayson. It is usually read simply as "son of Cass". Cayson first reached the US top 1000 in 2011, climbed to number 550 in 2016 and has settled at number 835 among boys in 2025.