Källström is a Swedish surname, simplified Kallstrom. Notable people with the surname include: Kim Källström (born 1982), Swedish footballer. Harry Källström (1939–2009), Swedish professional rally driver. James Kallstrom (1943–2021), American Federal Bureau of Investigation (FBI) agent. See also. Marjo Matikainen-Kallström (born 1965), former Finnish cross-country skier https://en.wikipedia.org/wiki/K%C3%A4llstr%C3%B6m