The Dutch historical dictionary (we say "hiep hiep hoera") says it might stem from Prussian soldiers, but that an older reference exists about use by English sa

The Dutch historical dictionary (we say "hiep hiep hoera") says it might stem from Prussian soldiers, but that an older reference exists about use by English sailors, and there was a considerable linguistic exchange between seamen. Another option it cites is that it came via the French houra from the Russian "urá", a transcription of a Kozak war cry. There's no way whatsoever that it is tied to the Holocaust. If we take that path, I guess books will be banned next, so they can no longer be burned.