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Well, here's their names in japanese
ルヴル Ruvuru/Ruburu
オルセ Oruse
エルミタ Erumita
I have no idea about the licensed english versions names or why they were chosen.
Names are usually a matter of great debates.
The way from Ruvuru to Rubel is actually not that big, especially when you speak it fast.
This can be even more daunting when you translate from japanese to a different language, apart from english. It could, for example, be a common word borrowed from french, or german or spanish..you get the point.
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