Coy, Vance, and Hatfield's names are obvious references to the infamous and real-life mid&late-1800s dispute between the two southern families, the Hatfields and the McCoys (this is now a household expression among Americans to describe two or more foolishly-squabbling people --- "those folks are like the Hatfields and McCoys"). Vance's name is especially significant, since James ("Crazy Jim") Vance --- a relative of the Hatfields --- is the person traditionally suspected of having started the feud by purportedly murdering one of the McCoys in 1865.
Actor Christopher Mayer later played another character named "Vance" in the "Baywatch" episode, "Countdown".