Orestes

It would be more correct to say that this name is derived from the Greek noun ὀρέστης (orestes):

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• http://www.perseus.tufts.edu/hopper/morph?l=o)re%2Fsths&la=greek&can=o)re%2Fsths (in English)
• https://lsj.gr/wiki/%E1%BD%80%CF%81%CE%AD%CF%83%CF%84%CE%B7%CF%82 (in English)

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As you can see, it is a little bit difficult to pin down the precise meaning of the word. At least the latter source indicates that it consists of the Greek noun ὄρος (oros) meaning "mountain, hill" combined with the Greek suffix -της (-tes), which forms nouns that represent a state of being:

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• https://en.wiktionary.org/wiki/-%CF%84%CE%B7%CF%82#Ancient_Greek (in English)

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Also compare the Greek suffix -τής (-tes), which is appended to verbs to form agent nouns:

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• https://en.wiktionary.org/wiki/-%CF%84%CE%AE%CF%82#Ancient_Greek (in English)

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Lastly: for the sake of comparison, here is a list of ancient Greek words that end in -της (-tes), as many of them will be nouns that contain that suffix (and are therefore somewhat comparable to the aforementioned word 'orestes'):

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• http://www.perseus.tufts.edu/hopper/resolveform?type=end&lookup=ths&lang=greek (in English; select 'Latin transliteration' at "Greek Display" in the display preferences) [noted -ed]

Derives from Greek "Ορεστις" deriving from: ορνυμι= to rebel.

In the myth Orestes was protected by Apollo from the Furies and eventually freed from them by Athena. I love that story, it shows Artemis, Apollo and Athena's good side compared to their bad.

Orestes is famous for being tormented by the Furies, nine gods whose express purpose is to punish those who kill their mothers.