Kierkegaard is a Danish philosopher, theologian, and writer known for his existentialist ideas. Synonyms for the name Kierkegaard include Søren Aabye Kierkegaard, Søren Kierkegaard, and Søren Aabye. Kierkegaard's works explore the concepts of faith, freedom, and human existence. He is considered one of the most influential philosophers of the 19th century and his ideas have had a profound impact on philosophy, literature, and theology. Notable works by Kierkegaard include Fear and Trembling, The Sickness Unto Death, and Either/Or. His legacy continues to inspire and inform modern philosophical thought.