Meaning and Name Origin
Cadyn \c(a)-dyn, cad-yn\ as a name for boys is of Scottish derivation, and Cadyn means "son of Cadán". Cadyn is a derivative of Caden (Scottish): from the Scottish surname McCadden. Not frequently used as a boys' name.
Cadyn is an uncommonly occurring given name for men. Cadyn is an unusual last name too for both adults and children. (2000 U.S. Census)
Below is a charted analysis of the popularity of the boy name Cadyn and corresponding names. Popular variation forms of Cadyn (#unlisted) rated in the Top 1000 are Kaden (#171 a year ago), Cayden (#197), Caden (#198), Kaeden (#896), Kadin and Kadyn. Usage of these boy names was at its apex in the year 2007 and has become much lower since, with the versions Kaeden and Kadin becoming less stylish. Cayden (#197), Kaden (#171) and Caden (#198) are three of the more fashionable birth names in this list. (2014 Birth Statistics)
Cadyn is pronounced similarly to Caidan, Caiden▲, Caidin, Caidon, Caydan, Caydin, Caydon, Kadan and Kadon. Another suggested similar baby name is Cadmo. Like Cadyn, these names are not frequently used.