From an Old French name, Melisende, of Germanic (Frankish) origin, from amal ‘labour’ + swinth ‘strength’. This was the name of a daughter of Charlemagne. It was adopted by the Normans and introduced by them to Britain.
Scottish: habitational name from a district in Ayrshire, first recorded in 1153 in the form Cunegan, a Celtic name of uncertain origin. The spellings in -ham, first recorded in 1180, and in -ynghame, first recorded in 1227, represent a gradual assimilation to the English placename element -ingham.