Meaning Dillan' comes from the Welsh for 'sea', or 'great tide'. In Welsh mythology Dylon was the God of the sea. Origin of Dillan Welsh +-100%Zoom level changed to 1 Popular Middle Names King, Nicholas, Shane, Thomas, Deshawn, Jerome Pronunciation 🔊 Listen Dillan DIHL-ahN Similar Names Dillion Dyllan Dylon Paden Murthuile Merlyn Pwyll Myrddin Efan Dillon Year by Year Popularity of Dillan