Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
MERRYWEATHER
As described in historical dictionaries
Patronymica Britannica (1860)
MERRYWEATHER. Formerly an idiomatic phrase for joy, pleasure, or delight. Halliw. Hence probably applied to a person of hilarious temperament. Fairweather and Fiueweather ai'e analogous surnames.
Surname type: Occupational name
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English