Lithium

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early 19th century: from lithia + -ium.

wiktionary

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From New Latin lithium, from lithia (in reference to Ancient Greek λίθος(líthos, “stone”)) + -ium.

etymonline

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lithium (n.)

silver-white metallic element, 1818, with element ending -ium + lithia, Modern Latin name given by Swedish chemist Jöns Jacob Berzelius (1779-1848) to the earth from which it was extracted, from Greek lithos "stone" (see litho-). The name indicates its mineral origin and distinguishes it from two previously known alkalis of vegetable origin.