The correct name of Pb SO4 is Lead(II) sulfate.
In this compound, ‘Pb’ stands for lead, and the Roman numeral II indicates that lead has a +2 oxidation state in this particular sulfate compound. The sulfate ion, SO42-, carries a -2 charge. To achieve neutrality in the compound, we need one lead ion with a +2 charge to balance out the two negative charges from the sulfate ion. Hence, the full name Lead(II) sulfate accurately reflects both the composition and the oxidation state of lead in the compound.