Dylan

From the Welsh prefix dy meaning "to, toward" and llanw meaning "tide, flow". According to the Fourth Branch of the Mabinogi [1], Dylan was a son of Arianrhod and the twin brother of Lleu Llaw Gyffes. Immediately after he was baptized he took to the sea, where he could swim as well as a fish. He was slain accidentally by his uncle Gofannon. According to some theories the character might be rooted in an earlier and otherwise unattested Celtic god of the sea.

Famous bearers include the Welsh poet Dylan Thomas (1914-1953) and the American musician Bob Dylan (1941-), real name Robert Zimmerman, who took his stage surname from the poet's given name. Due to those two bearers, use of the name has spread outside of Wales in the last half of the 20th century. It received a further boost in popularity in the 1990s due to a character on the television series Beverly Hills 90210.