Even more if we used Olorin-son-Illuvatar (pretty sure the Maia are the children, not grandchildren, of the One).
I’m pretty sure the human version would be God, seeing as Tolkien’s legendarium is technically supposed to be the past of our world. He’s just translating the old texts. I think we’re the Seventh Age, though I may be misremembering. Olorin-son-God would be completely inexplicable to everyone but legendarium fans though, lol!