Meaning Keiran is Celtic name for a boy, it means 'Dusky or dark-haired'. Origin of Keiran Celtic , Irish Popular Middle Names Brayden, King, Matthew Pronunciation 🔊 Listen Keiran KeIR-Ahn Similar Names Kieron Conchobar Condan Colbert Dhoire Kerr Kier Flyn Kermode Kirwin Year by Year Popularity of Keiran