Darby was born Deborah Zerby in Los Angeles, the daughter of professional dancers Inga (Wiere) and Jon Zerby (the "Dancing Zerbys" or "Dancing Zerbies"). Her father nicknamed her Derby saying "I thought Derby Zerby would be a great stage name". Her mother was from Budapest. Her mother's siblings were comedians who performed as the Wiere Brothers.[citation needed]
She performed as a singer and dancer under the name "Derby Zerby". Believing that she could not "hope for serious important roles in films with a name like "Derby Zerby", she renamed herself "Kim", because it was the name of a popular girl in her high school that she admired, and "Darby", as a variation of "Derby".
Darby began acting at age fifteen. Her first appearance was as a dancer in the film Bye Bye Birdie (1963). Her television work included Gunsmoke (1967 episodes "The Lure" and "Vengeance"); Bonanza (1967 episode "The Sure Thing"); and as a young girl approaching adulthood on an all-child planet in the "Miri" episode of the original Star Trek series.

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