Morgenthau rhymes with:
anyhow, bandow, barbakow, brandow, curacao, eyebrow, goodenough, highbrow, jarchow, landau, lichtblau, luau, powwow, snowplow, somehow, sorkow, tsingtao, turnbough, yarbough
Morgenthau sounds like:
marchand, marchant, marciante, margined, marquand, merchant, morgante, morganti