Sodium

google

ref

early 19th century: from soda + -ium.

wiktionary

ref

Coined by British chemist Humphry Davy in 1808, from  soda +‎  -ium, "soda" being from Italian soda, which may be from Arabic سُوَّاد‎ (suwwād, “ saltwort”) or Arabic سُوَيْدَاء‎ (suwaydāʾ, “Suaeda”). [1]

etymonline

ref

sodium (n.)

metallic alkaline element, 1807, coined by English chemist Humphry Davy from soda; so called because the element was isolated from caustic soda (sodium hydroxide). The chemical symbol Na is from natrium, alternative name for the element proposed by Berzelius from natron, a name of a type of soda.