Why symbol of sodium Na?

Answer 1

The element sodium was discovered by ancient romans who spoke latin.

In latin the word for sodium is Natrium, hence the symbol of Na.

Answer 2

The symbol for sodium, Na, comes from its Latin name "natrium." This symbol was derived from the word "natron," which was a naturally occurring mineral that contains sodium carbonate. The symbol Na is used to represent sodium in the Periodic Table to avoid confusion with the element nitrogen.