Hay valley or hedged valley
Haydyn is a modern creative spelling of the English surname Hayden. It derives from Old English elements meaning a valley where hay is harvested or a valley enclosed by hedges.
Less common today
Haydyn isn't in the latest US Top 1000. It last peaked at #3,152 in 2006.
US births per 5-year period, 1990–present (SSA data).
