My daughter needs to know this for a school project. Thank you in advance.
Has she tried checking a dictionary? It might be in there.
This should help:
From Silver | Definition of Silver by Merriam-Webster
The OED says the Germanic root *silubr- (the * means it is a reconstructed form that is not attested) is “related indeterminately to various Balto-Slavic forms, perhaps all ultimately of Oriental origin”. Heaven knows what they mean by “Oriental”. It’s serebra in Russian and srebra in Bulgarian.
:smack: Apparently, technology has made me forget to use basic reference books. Thank you. You have been very helpful 
John Reid thought it was a good name for a white horse, and it tied in with the metal he used for his bullets.
This website has the origins of each element name, the name in many languages, and stories about how the elements were discovered. It’s too bad your daughter had to do silver, which has an obscure origin. Some of the origins of the element names are quite interesting. Cobalt is named after goblins (kobolds) that were thought to live in mines, and nickel is named after the Devil. Nickel was named kupfernickel, ‘Old Nick’s copper’ or ‘Devil’s copper’ by a frustrated miner who found it while searching for copper.
FWIW, Kupfernickel does not mean Nick’s copper in German. The word order’s wrong. Nick(el)'s copper would be Nickelkupfer, not the other way round.
I always liked copper, which was originally found on Kypros, or Cyprus - as, of course, were cypresses. You’ve gotta love eytomology.
Actually, Maximus in Gladiator got there first: one of his horses was named Argentum.