Borax. You can still find some in the laundry detergent aisle.
Borax is the common name
Another common name doesn't exist; the code of sodium benzoate is E211.
The common name for the formula Na is sodium.
The common name of sodium bromide is simply bromide.
Sodium Benzoic Acid
There is, to my best knowledge, NO other, more common name for sodium arsenide than sodium arsenide. So that's it.
The common name for borax is sodium borate.
The common name for NaCl2 is sodium hypochlorite.
The common name for 3NaHCO3 is sodium bicarbonate.
Sodium hydroxide is commonly called lye or caustic soda.
The common name for Sodium Chloride is table salt. But salt and Sodium are not the same thing. There is no real "common" name for Sodium itself, but I assume you mean Sodium Chloride.
Sodium chloride is the chemical name for common table salt