Son of the sea or born from the ocean
Dyllen is a modern spelling variation of the Welsh name Dylan. In Welsh mythology, Dylan was a sea god or hero associated with the waves, specifically the 'son of the wave'.
Less common today
Dyllen isn't in the latest US Top 1000. It last peaked at #5,983 in 2006.
US births per 5-year period, 1990βpresent (SSA data).