What would be the formula and name of the ionic compound formed when iron 2 reacts with bromine?

The reaction of iron(II) salts with bromine is a redox reaction forming iron(III).

The aqueous reaction with bromine water is typical:-

2Fe2+ + Br2 -> 2Fe3+ + 2Br-

If you started with iron(II) bromide, iron(III) bromide would be formed