How come Kilauea the city is located on Kauai, while Kilauea Volcano is located on the Big Island? Why is the city and the volcano on different islands? Am I just sadly confused?

1. Many location names are used on all the islands. For example Waimea can be found on Oahu, Kauai and Hawaii. Think of how many cities or towns across the US share the same name. No different in Hawaii
2. I tried researching this a bit but without success. It might have been the name of Hawaiian royalty. So it is like Washington state and Washington D.C.

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