The historian Karel De Flou cites many de or van Hasebroucks beginning with Gilles de Hasebroch, senechal of Boulonnais around 1100. However, one must distinguish, without a doubt, in this list the members of the lord’s family from those who had the name because they came from the above-mentioned town or from Assebroeck, Belgium, (near Bruges).
Besides, several d’Hazebrouck families may have existed over time.Finally, the problem gets still more complicated when one learns that the Hauweel family had similar arms to those of Hazebrouck and possessed land at the same location. Did they succeed the Hazebroucks, were they allied to them or were they related; was it the same lineage with multiple branches under two different names? (We still don’t know.)