Meaning A boy's name of Gaelic origin, it means "Slender; Fair Form of Caelan." Origin of Kalen Gaelic , Irish Popular Middle Names Amier, Edward, Jackson, James, Joseph, Kristofer, Liam Pronunciation 🔊 Listen Kalen KAL-en Similar Names Keeland Keldan Findlay Cael Beagin Frannsaidh Gayner Gervin Muireach Raghallach Year by Year Popularity of Kalen