Diederik is a common Dutch name, often used for boys. It has roots in the Germanic name Theodoric, which means "ruler of the people." The name is popular in the Netherlands and can be found in various forms across different cultures. In addition to being a name, Diederik can also refer to notable individuals, such as Diederik Stapel, a former Dutch social psychologist known for his controversial research practices. The name may also appear in literature and media, representing characters or themes related to leadership and community.