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 Kaelan Kaelin Kalen Keillan Kelden Kelle Keelan Keeland Finley Kenneth Year by Year Popularity of Keilan