Meaning A boy's name of Gaelic origin, it means "Slender; Fair Form of Caelan." Origin of Kaelin Gaelic , Irish Popular Middle Names Jaxsin Pronunciation 🔊 Listen Kaelin Similar Names Tristan Kalem Keeland Keldan Findlay Cael Beagin Frannsaidh Gayner Gervin Year by Year Popularity of Kaelin