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Last name origins & meanings:

1. French: either from Old French tache ‘hook’, ‘buckle’, ‘loop’; ‘distinctive mark’, possibly applied as a nickname for someone with a deformity or distinctive mark. (Taché is an adjectival form of this name.) Alternatively, it may be a habitational name from any of various places named Tâche or La Tâche, for example in Charente-Maritime and Vienne.
2. Romanian: unexplained.