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 Kalem Keeland Keldan Findlay Cael Beagin Frannsaidh Gayner Gervin Muireach Year by Year Popularity of Kaelan