Variants of this surname Morjeu is Morjau, Morjeau, Morjaeu. All three are Belgium surnames. I think it is of French origin. The surname Morgeau is found in France, perhaps a variant. A variant surname of Morgeau is Morigeau, a Montana, US. Perhaps it could be a form of French Moreau? or perhaps Morgue. I don't know the etymology, but I don't think it is from a habitational name. I'll look further into this surname some time later.