My wife is from Saguenay, Québec and there is a large bay there named Baie des Ha! Ha! which is fed by the Rivière Ha! Ha!, both of which take their name from this feature. There are also other locations in the area that use this as a name.
If it's French, why didn't we use this to keep the Germans away instead of the Maginot line? The Panzers would have come, been on the lower part, gone Ha ha and come back home defeated.