From the Greek word melissa ‘honey bee’. It is the name of the good witch who releases Rogero from the power of the bad witch Alcina in Ariosto's narrative poem Orlando Furioso (1532). The name was fairly popular in the 1990s, along with other girls’ names sharing the same first syllable.
Scottish: nickname from Gaelic cam ‘crooked’, ‘bent’ + beul ‘mouth’. The surname was often represented in Latin documents as de bello campo ‘of the fair field’, which led to the name sometimes being ‘translated’ into Anglo-Norman French as Beauchamp.