Answer is "copper(i) carbonate".
The compound is Cu₂CO₃.
Cation = Cu⁺
Anion = CO₃²⁻
First we have to state the name of the cation. The cation is copper. Charge on the cation in Cu₂CO₃ is +1. Hence, the name of the cation is copper(i).
Then, let's name the anion of the compound. The anion is carbonate.
When naming whole compound first state the cation and keep a space. After the space, state the name of anion.
Hence Cu₂CO₃ can be named as copper(i) carbonate.