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Jovial derives from the Roman God Jove (Jupiter), who was also the patron of hospitality.

Here are Merriam Webster's synonyms and their various meanings

MERRY, BLITHE, JOCUND, JOVIAL, JOLLY

JOLLY mean showing high spirits or lightheartedness

MERRY suggests cheerful, joyous, uninhibited enjoyment of frolic or festivity "a merry group of revelers"

BLITHE suggests carefree, innocent, or even heedless gaiety "arrived late in his usual blithe way"

JOCUND stresses elation and exhilaration of spirits "singing, dancing, and jocund feasting"

JOVIAL suggests the stimulation of conviviality and good fellowship "dinner
put them in a jovial mood"

JOLLY suggests high spirits expressed in laughing, bantering, and jesting "our jolly host enlivened the party"