How do you name a -covalent- compound?
For the first part, if there is only one atom of the element it is simply the name of the element. If the first element is a single Na atom then the name starts with "sodium". If there is more than one atom then it starts with a prefix that tells the number of atoms. If the compound starts with 2 Na it will be "disodium". If three Na, "trisodium".
For the last element of the compound it will also have a prefix telling how many of those atoms are there ( "mon" for 1 ) but will also change the suffix of the last element's name to "ide". So, 2 Cl in the last part of a compound will be "dichloride", 3 Cl would be "trichloride". If it's just one Cl at the end of an element it will be called simply "chloride".