You can sen here etymology of all elements: https://en.wikipedia.org/wiki/List_of_chemical_element_name_etymologies Those names come from Latin, Greek annd other languages and are related with: 1) Geographic places: countries, towns, villages... read more
Probably from Italian sida (or directly from Medieval Latin soda)"a kind of saltwort," from which soda was obtained, of uncertain origin. The symbol Na is from the Modern Latin noun natrium, derived from Greek νίτρον (nítron),"natural soda, a kind of salt" + Latin -ium. read more