Apparently the native name for the Homeworld hadn't yet been determined by the time of TNG: Heart of Glory. Korris (Vaughn Armstrong) has a line to the effect of, "I would rather die than let the traitors of Kling pick the meat from my bones."
Someone decided Kling sounded too wimpy or something, and they began trying to come up with a better name, which was retconned into everything else.
Kronos however, instantly makes me remember a sci-fi movie from 1957 called Kronos
, about a giant machine from outer space that lands on earth.
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If embed doesn't work: http://www.youtube.com/watch?v=dxwxL6xDT3s