Jansen is a common surname of Dutch origin, often associated with the meaning "son of Jan." It is prevalent in the Netherlands and among Dutch-speaking communities worldwide. The name can also be found in various forms, such as Janssen or Janssens, reflecting regional variations. In addition to being a surname, Jansen is also a name used in various contexts, including businesses and institutions. For example, Jansen Pharmaceuticals is a well-known company in the pharmaceutical industry, focusing on innovative treatments and research.