My boyfriend wants my mother’s maiden name for “prayer” because I’m sick, but something feels off.

My boyfriend (nigerian ) asked me for my mother’s maiden name. He gave me different and conflicting reasons why he needs it and then eventually he said it’s because his dad asked for my mom’s maiden name to pray for me. I am sick currently. It is bothering me that maybe he has other intentions, and he doesn’t have the best history in terms of our relationship. Should I trust him and give it? I’m not nigerian and he told me his father is a priest or chief and I think he does magic sometimes. Please can you give me advice my brothers and sisters. Thank you