Iou rhymes with:
askew, byu, cmu, cue, debut, depew, depue, dfw, ewe, few, fitzhugh, fondue, gue, hew, hewe, hue, hugh, imbue, kew, kyu, lemieux, lhommedieu, liu, mccue, mcgue, mchugh, meiyuh, mew, peugh, pew, phew, pugh, q, q., que, queue, review, revue, schewe, skew, spew, suu, thankyou, true-view, u, u., uwe, view, vue, whay-yu, yew, yoo, you, yu, yue
Iou sounds like:
i, i., ia, iie, io, iowa, iwai, iwo