Rankine is a surname and occasional first name, related to Rankin. The male given name "Rankin" was a diminutive form of the given name "Rand(e)" found in medieval Scotland and England, with the hypocoristic suffix "-kin" attached. The name is related to Randolph and other names.

"Rankine" as a given name may be derived from Ragnar, an Old Norse name meaning "warrior" or counsel, which travelled south with the Vikings, transitioning to its present form there during medieval times.

People with the surname Notable people with the surname include:

W. J. M. Rankine (1820–1872), Scottish engineer and physicist Rankine body an elliptical shape of significance in fluid dynamics, named for Rankine Rankine scale, an absolute-temperature scale related to the Fahrenheit scale, named for Rankine Rankine cycle, a thermodynamic heat-engine cycle, also named after Rankine Rankine Lecture, a lecture delivered annually by an expert in the field of geotechnics Alan Rankine (born 1958), Scottish rock musician Alexander Rankine (1881–1956), British physicist Andy Rankine (1895–1965), Scottish footballer Camille Rankine, American poet Claudia Rankine (born 1963), American poet and playwright Daniel Rankine, Australian musician, stage name Trials Dean Rankine, Australian comics artist George Rankine Irwin, (1907–1998) American materials scientist James Rankine (1828–1897), South Australian politician Jennifer Rankine (born 1953), South Australian politician John Rankine (1918–2013), British science fiction author John Rankine (Australian politician) (1801–1864), South Australian physician and politician John Rankine (governor) (1907–1987), British colonial administrator Leila Rankine (1932–1993), Aboriginal Australian poet Mark Rankine (born 1969), English footballer Michael Rankine (born 1985), English footballer Scotty Rankine (1909–1995), Canadian Olympic athlete Thomas Rankine (born 1978), American musician William Rankine Milligan, Lord Milligan (1898–1975), Scottish judge and politician

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