English origins, from 12th century,means compassion.
Hit the peak of popularity In the 50's.
Apparently an assimilated form of Mercy.
Merry is occasionally a short form of Meredith.
Nowadays the name is usually bestowed because of its association with the adjective denoting a cheerful and jolly temperament.
In the accent of Canada and the central and northern US there is no difference in pronunciation between Merry and Mary.
Merry Anders appeared in many movies and TV shows.