8-way, if you include off-off-off: 0-0-0, 0-0-1, 0-1-0, 0-1-1, 1-0-0, 1-0-1, 1-1-0, 1-1-1
And don't forget that you should be able to reverse the phase on each of them too, so you'd probably want three centre-off DPDT switches. Where's the "evil grin" emoji? Ah, 😈 😈