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Ariaspes is an ancient Persian name (presumably Hellenized):
https://en.wikipedia.org/wiki/Ariaspes
https://www.behindthename.com/name/ariaspes/submitted

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Thersames might have got its ending from the name Arsames:
https://en.wikipedia.org/wiki/Arsames_(disambiguation)
https://www.behindthename.com/name/arsames/submitted

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By the way, I've found this website, according to which the name Thersames is actually spelled Thersamnes:
https://cord.ung.edu/suck1agl.html
The name Ariaramnes has the same ending:
https://www.behindthename.com/name/ariaramnes/submitted
https://en.wikipedia.org/wiki/Ariaramnes