What is the name of Ponyo's father in Ponyo?

The name of Ponyo’s father in Ponyo is Fujimoto. He is a former human who became an underwater wizard and lives beneath the sea with his daughter, originally named Brunhilde, and her many sisters.

Fujimoto discovers that Brunhilde has escaped while exploring the ocean and searches for her after she is rescued by the five-year-old Sōsuke. He is protective and distrustful of humans, believing their pollution has damaged the natural world. This makes him an early obstacle to Ponyo’s wish to become human.

A common mix-up is Granmamare, who is Ponyo’s mother, not her father. Sōsuke is the human boy Ponyo befriends, while Koichi is Sōsuke’s father. Fujimoto’s unusual appearance and magical powers can also make him seem more like a sea spirit than a parent, but the film clearly identifies him as Ponyo’s father.

The character’s conflict with Ponyo drives the film’s central family story: his fear of the human world clashes with Ponyo’s affection for Sōsuke and her desire to live on land.