Great tide or son of the sea
Dillyn is a modern creative spelling of the Welsh name Dylan. In Welsh mythology, Dylan was a sea god, and the name is derived from the elements 'dy' (great) and 'llanw' (tide).
Less common today
Dillyn isn't in the latest US Top 1000. It last peaked at #3,369 in 1999.
US births per 5-year period, 1990–present (SSA data).
