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There's just a huge number of names ending in -en/-on/-an, the -dens are just a part of it. I think the sound became popular with Aidan/Aiden, then some parents discovered the obscure Old Testament Jadon, respelled in Jaden to get the desired pronunciation. From there it seems that names that were popular a generation ago got their beginnings tacked onto names ending in -den, like
Brandon, Brendan, Brian --> Brayden/Braden/Braydon/Braeden, etc.
Kate, Casey --> Caden/Cayden/Kadin, etc.
And Hayden as an established last name seemed to join the pack. More recently, I've seen Zayden's, Xayden's, and Rayden's... Shayden made the Top 100 for Hawaii in 2005.