Gyllenhammar is a surname. Notable people with the surname include: Cecilia Gyllenhammar (born 1961), Swedish author. Charlotte Gyllenhammar (born 1963), Swedish artist. Pehr Gyllenhammar (1901–1988), Swedish insurance company executive. Pehr G. Gyllenhammar (born 1935), Swedish businessman. Ralf Gyllenhammar (born 1966) Swedish musician https://en.wikipedia.org/wiki/Gyllenhammar