The name Kaiden is most likely a product of it sounding similar to other trendy names of the 2000s, such as Kayden, Brayden and Hayden. Other theories suggest that it's a variant of the Irish surname Caden, but even Caden didn't grow popular in the U.S. until 2000. Either way, Kaiden has been a top-200 boy's name every year since 2008, per the Social Security Administration. It's not as common as Kayden, but American parents tend to prefer it over Caden, Caiden, Kade and Kaden, as of 2023.
