Responses
I think they said she was a child blessed by the demon king and the goddess.
Her father was mentioned back in chap 243 before they mentioned that the supreme goddess and the demon lord had blessed her with powers. The demon lord and the supreme goddess never had a kid together.
Ohhhh... okay, I guess I either misunderstood or didnt remember well... thanks!
Wait... havent the story said that Merlin was the daugther of the demon king and the goddess?!