Cason has been used in the US based on the surname, historically. See https://www.callawaygardens.com/the-gardens/about/history/cason-j-callaway/ In my opinion, at least many of those who use it today are intending it as a surname-name, and not as an invention that sounds like Mason and Jason (though the rhyme probably makes it more appealing). The surname is not unheard-of. [noted -ed]
I believe this name is like Caden -- its use as a given name is because of its sound (rhyming with Mason. Grayson, and Jason and fitting in with other newly created names like Brayson) and it may not be completely correct to think of all of the variant spellings like Kayson, Caeson, Caison, Kacen, etc. etc. as etymologically deriving from this surname. They may be better thought of as inventions based on popular sounds like Zayden. [noted -ed]
― Anonymous User 5/10/2021
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Reminds me of both the song "The Caissons go Rolling Along" and the phrase "Case in point."
See https://www.callawaygardens.com/the-gardens/about/history/cason-j-callaway/
In my opinion, at least many of those who use it today are intending it as a surname-name, and not as an invention that sounds like Mason and Jason (though the rhyme probably makes it more appealing). The surname is not unheard-of. [noted -ed]