Here's how to name it:

* Sodium (Na) is a metal, so it keeps its name.

* Oxygen (O) is a nonmetal, and in ionic compounds, the nonmetal's name is changed to end in "-ide."

* Since sodium has a +1 charge and oxygen has a -2 charge, the formula requires two sodium ions (Na⁺) for every one oxide ion (O²⁻).

Therefore, the name is sodium oxide.