The name of the compound Ca(NO₃)₂ is

In the cris-cross method, we write the oxidation state of cation in the subscript of anion and of anion in the subscript of cation irrespective of its charge.

The compound contains two calcium ions and nitrate ions. Calcium has the valency of +2 and nitrate has the valency of -1. 

The compound is formed by criss-crossing the valency so, the name of the compound $\mathbf{Ca}{\mathbf{\left(}{\mathbf{NO}}_{\mathbf{3}}\mathbf{\right)}}_{\mathbf{2}}$ is calcium nitrate. It is an ionic compound.