The correct name for the compound Sn3(PO4)2 is tin(II) phosphate.
To break it down, Sn stands for tin, which is a metal that can have multiple oxidation states. In this compound, it has an oxidation state of +2, hence the name tin(II). The PO4 group is the phosphate ion, which has a charge of -3. Since there are three tin ions contributing a total of +6 charge (+2 each), we need two phosphate ions contributing a total of -6 charge (-3 each) to balance the compound, leading to the formula Sn3(PO4)2.