Here's why:

* Cu₂O indicates that the compound contains two copper atoms (Cu) and one oxygen atom (O).

* Copper(I) signifies that the copper ions in the compound have a +1 charge. This is indicated by the Roman numeral I.

* Oxide is the common name for the anion O²⁻.

Therefore, the full name for Cu₂O is Copper(I) oxide, and its alternative name is Cuprous oxide. The term "cuprous" is an older naming convention that is still used sometimes, but the preferred name is Copper(I) oxide.