What is the significance of the names "Rama" and "Krishna" (and also the original names of Draupadi and Vyasa) that literally mean "(pleasantly) dark" in Hindu epics? Does this also mean that ancient India did not have an obsession with light skin and may have associated dark skin with beauty?

What is the significance of the names "Rama" and "Krishna" (and also the original names of Draupadi and Vyasa) that literally mean "(pleasantly) dark" in Hindu epics? Does this also mean that ancient India did not have an obsession with light skin and may have associated dark skin with beauty?