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Na is the chemical symbol for sodium because natrium is the Latin name.

They said "sodium has the chemical symbol Na" which is completely true, if intuitive.

Na is the chemical symbol for sodium. What's strange in the statement?

They probably confused 'sodium' with 'salt' and missed the Natrium in NaCl.

Apologies for linking to Quora:

https://www.quora.com/Who-renamed-Natrium-and-Kalium-to-Sodi...

If you want to explain an acronym that has its basis in the names of chemical elements you should probably use the same words the scientists that came up with the acronym used.