One possibility, suggested by the linguist Jean-Claude Muller, a member of Luxembourg's Institut grand-ducal, is that it comes from the Spanish word for bean: judÃa.
Massachusetts Institute of Technology | California Institute of Technology | Art Institute of Chicago | Institute for Advanced Study | American Institute of Architects | Georgia Institute of Technology | Grand Prix motorcycle racing | Grand Canyon | Grand Trunk Railway | Grand National | Grand Rapids, Michigan | Rensselaer Polytechnic Institute | Grand Prix | Grand Duchy of Lithuania | Rochester Institute of Technology | Franklin Institute | Royal Institute of Technology | Pasteur Institute | Institute of Contemporary Arts | Grand Central Terminal | Grand Theft Auto: San Andreas | California Institute of the Arts | Institute of Electrical and Electronics Engineers | British Film Institute | Grand Theft Auto IV | Grand Tour | Grand Ole Opry | Pratt Institute | National Cancer Institute | Virginia Military Institute |