Dillan

Dillan is an English variant spelling of Dylan, a name rooted in Welsh, derived from the elements dy, meaning great or tide, and llanw, meaning flow or sea, giving an overall sense of son of the sea or born from the ocean. The name gained widespread popularity largely through the Welsh hero Dylan in the Mabinogion, a collection of medieval Welsh tales. The spelling Dillan, along with Dillon, reflects phonetic adaptations that became common particularly in English-speaking countries. Related forms include Dylan, Dyllan, and Dillon.