Dylan \d(y)-lan\ as a boy's name (also used as girl's name Dylan), is pronounced DIL-an, DUL-an. It is of Welsh origin, and the meaning of Dylan is "son of the sea". Mythology: a legendary Welsh hero. Modern use is probably homage to poet Dylan Thomas. Catherine Zeta-Jones, who is Welsh, chose this name for her son with Michael Douglas. Some of the variants are more closely related to the homonym Dillon. Singer Bob Dylan; actor Dylan McDermott.
For more information, see also the related name Taylan.