What does joy mean in a Spanish name or what is the Spanish name for joy?
Spanish words for 'joy' include: alegría, júbilo, regocijo,
felicidad.
I am not aware of a Spanish equivalent to the name 'Joy', but
the Spanish stem 'joy-' (pronounced 'khoy') related to jewellery,
thus for example:
joya = jewel, gem
joyero/a = male/female jeweller
joyería = jeweller's shop