Horning is a German language surname. Like the related Hörning and Hornung it may either be derived from the term hornung and in this case be used as a nickname for someone with a relationship to the month of February or derived from Middle Low German hornink and then used for a person born out of wedlock (horns as symbols of cuckoldry) or a topographic name referring to the hornlike shape of a property.Notable people with the surname include: Al Horning (1939–2023), Canadian politician Jim Horning (1942–2013), American computer scientist Karen Horning (born 1966), Peruvian swimmer Marjorie G. Horning (1917–2020), American biochemist and pharmacologist Ross Horning (1920–2005), American historian Steamer Horning (1892–1982), American football player William A. Horning (1904–1959), American art director

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