Jahnke is a German surname meaning "kin of John" or "kin of Johann". The name likely originated in northeast Germany, possibly Pomerania. Notable people with the surname include:

  • Eugene (Eugen) Jahnke (1863-1921), mathematician, author "Tables of functions with formulae and curves" with Fritz Emde
  • Gerburg Jahnke (born 1955), German comedian
  • Hugo Jahnke (1886–1939), Swedish gymnast
  • Kurt Jahnke (1882–1945), German-American intelligence agent and saboteur
  • Eric Jahnke (born 1972), American author, former editor of Beckett Basketball magazine
  • Ryan Jahnke (born 1978), American figure skater
  • Corey Jahnke (born 1966), American pharmacist, and self help author

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