During the baptismal service what does he say urged him to name the child? What was the name he gave the child?

Hoping that baptism will eject Morella’s demonic influence from her daughter, the narrator takes her to a priest to be dedicated and named. Without any particular name in mind, he is horrified when – after the priest asks for a name – he impulsively says “Morella.” At the sound of her new name, the younger Morella calls out “I am here!” and collapses to the floor, a corpse.