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The name of the river rAvi comes from Sanskrit irAvatI. irA is probably ultimately from a root iS (though, Sanskrit grammarians usually explain it differently), to move fast or flow. Whatever the source, irA means a refreshing drink, but the meaning extended to food in general. irAvatI is something/someone who provides food.

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ravi meaning sun comes from a different, but not quite clear, source. Sanskrit grammarians lint it to the root ru, to roar, but the semantic connection is weak.