Stachnik is a Polish-language surname. Originally it was a given name derived from the name Stanislaw, diminutive: Stach.Zofia Kaleta, Nazwisko W Kulturze Polskiej, 1998, p. 54 Notable people with the surname include: Sebastian Stachnik (born 1986), German footballer Walter Stachnik, Inspector General of the U.S. Securities and Exchange Commission References