Hallgren is a surname. Notable people with the surname include: Åke Hallgren (1918–2005), Swedish Olympic athlete. Eric Hallgren (1880–1956), Swedish police and civil servant. Frida Hallgren (born 1974), Swedish actress. Gary Hallgren (born 1945), American illustrator and underground cartoonist. Johan Hallgren (born 1975), Swedish musician. Konrad Hallgren (1891–1962), Swedish fascist. Mauritz A. Hallgren (1899–1956), American journalist, editor, and author. Sam Hallgren (a.k.a. Sam Van Hallgren), former host of the podcast Filmspotting. See also.
https://en.wikipedia.org/wiki/Hallgren