Keydon is of American origin, derived from combining the names Keith andendon. It means 'from the river meadow' or 'gateway to the valley'. The name has a modern sound and was likely coined by parents looking for unique options in recent decades.
"Keydon saw its peak popularity with 6 births each year between 2007 and 2011, with a total of 35 babies named Keydon born over these years."