- An English surname. of Norman origin.
- A male given name transferred from the surname.
- A female given name transferred from the surname.
- (cryptography) Often the malicious party in examples of threat scenarios (synonym: Mallet). See Alice and Bob.
From an Anglo-Norman nickname for an unfortunate person Maillorie, Malleorre, corresponding to the Old French adjective maleüré (unhappy, unlucky), from Old French noun maleür (unhappiness, bad luck), French malheur.