You cannot have a single compound name for MnBr₂ Na₃PO₄ because it represents a mixture of two distinct ionic compounds:

* Manganese(II) bromide (MnBr₂)

* Sodium phosphate (Na₃PO₄)

Let me explain why:

* Ionic Compounds: Ionic compounds are formed by the electrostatic attraction between positively charged ions (cations) and negatively charged ions (anions).

* Manganese(II) bromide: Manganese (Mn) forms a +2 cation (Mn²⁺) and bromide (Br) forms a -1 anion (Br⁻). To balance the charges, we need two bromide ions for every manganese ion, resulting in the formula MnBr₂.

* Sodium phosphate: Sodium (Na) forms a +1 cation (Na⁺) and phosphate (PO₄) forms a -3 anion (PO₄³⁻). To balance the charges, we need three sodium ions for every phosphate ion, resulting in the formula Na₃PO₄.

Since these two compounds have different constituent ions and their own unique chemical formulas, they cannot be combined into a single compound with a single name.