The story
Originating in an institute founded in 1964, DHI has about 30 offices throughout the world, with software development centres in Singapore and Hørsholm, Denmark, and approximately 1050 employees.
DHI takes its name from the acronym of the Dansk Hydraulisk Institut (Danish Hydraulic Institute), which was founded in 1964 by the Technical University of Denmark as Vandbygningsinstituttet (The Institute of Water Production) and changed its name in 1971; DHI - Institut for Vand og Miljø was formed in 2000 by the merger of that with Vandkvalitetsinstituttet (The Institute for Water Quality), and in 2005 further merged with the Dansk Toksikologi Center (Danish Toxicology Centre) and simplified its name to DHI.
From Wikipedia’s article on DHI (company), shared under CC BY-SA 4.0.5