Modern invented name blending Cash and the suffix -tyn, likely inspired by Ashton or Kasten.
Cashtyn is a modern phonetic remodeling of Caitlin (and its variants Kaitlyn, Katelyn, Caitlyn), a name that traces its lineage to the Greek *Aikaterine*—the source of Catherine—whose meaning has been variously attributed to 'pure' (from the Greek *katharos*) and to a pre-Greek Coptic name borne by Saint Catherine of Alexandria. Caitlin is specifically the Irish Gaelic form, pronounced roughly 'KAHT-leen' in Ireland though widely anglicized to 'KAYT-lin' in North America from the 1970s onward.
The shift from Caitlyn to Cashtyn represents a double move: the -sh- creates a softer central consonant, while the -tyn ending taps into the productive modern suffix seen in names like Peytyn, Brantyn, and Austyn. The embedded word 'cash' gives it an incidental connotation of financial confidence or street-level cool that some parents may find appealing as a subliminal quality. Whether intentional or not, such embedded words are part of how invented names accrue personality.
Cashtyn belongs to a large and creative family of names that take a well-loved phonetic shape—the Kay-sound opening, the two-syllable bounce, the nasal close—and ring variations on it. It represents naming as a form of folk art, where generations of parents act collectively as orthographic innovators, each generation finding new ways to make the familiar feel freshly theirs.