Greek Tantalos, ancient mythical king of Phrygia, a name of uncertain origin, perhaps literally "the Bearer" or "the Sufferer," by dissimilation from *tal-talos, a reduplication of PIE root *tele- "to bear, carry, support" (see extol), in reference to his long endurance, but Watkins finds this "unlikely" and Beekes writes that "An IE interpretation is most improbable." Compare tantalize.

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Definitions of Tantalus from WordNet

Tantalus (n.)
(Greek mythology) a wicked king and son of Zeus; condemned in Hades to stand in water that receded when he tried to drink and beneath fruit that receded when he reached for it;