Meaning This Gaelic name means "slender and fair." Origin of Keilan Celtic , Irish Popular Middle Names Allen, Dewayne, Elijah, Isaiah, John, Layne, Mario Pronunciation 🔊 Listen Keilan KEI-lan Similar Names Kalem Keeland Keldan Cael Galyn Giollaruaidh Keelen Gwylim Findlay Beagin Year by Year Popularity of Keilan