Some spells are in Greek, like Episkey or in Aramaic like Avada Kedavra or in another language like Alohomora.

Spell names don't really mean much. They are a designation more than anything, but they do help with control when you learn, similarly to hand movements. They are not necessary to perform magic though, so translating words a different way would not affect what the spell did, outside of the Floo network, where pronunciation determines where you go.