Meaning A boy's name of Gaelic origin, it means "Slender; Fair Form of Caelan." Origin of Kaelan Gaelic , Irish Popular Middle Names Ahmir, Isaiah, Matthew Pronunciation 🔊 Listen Kaelan KEYEH-lahn Similar Names Kaelin Kalen Keillan Kelden Kelle Keilan Keelan Keeland Kenneth Fin Year by Year Popularity of Kaelan