Boulevard and mannequin are Dutch words

The French word, boulevard was derived from the Dutch word bolwerk (before 1395), which is still in use today in The Netherlands and means ‘rampart’. The English word ‘bulwark’ is also a derivative of this Dutch word.
The French adapted several nautical terms from the Dutch around the late Middle Ages and sixteenth century when Holland was a world leader in shipbuilding and nautical science. The French word for the port side of a ship, bâbord, is from the Middle Dutch word for port, bakboord. The other side of the ship is called tribord in French and this comes from stuurboord, the Dutch word for ‘starboard’. Yacht has made it into French (and English and many other languages) from the Middle Dutch word jaght, a word connected to the verb jagen ‘to chase’. The Dutch word for yacht is now jacht. Even the French word, fret, meaning ‘freight’ carried by ships is from the Middle Dutch word, vrecht for ‘sea freight’
And who would have thought that mannequin, the French word for fashion model, came from the Dutch? It is from the Middle Dutch word (circa 1450) mannekijn, meaning ‘little man or puppet' (see picture). Source