the treatment of diseases, injuries, and other physical ailments with baths and bathing, especially in natural mineral waters. Origin of balneotherapy.
The name Percy originated in France. It means piercing the valley which also can mean fighting the lower side, the evil side, to reach justice. Jackson means son of Jack. I know, I don't get it either.
Percy was named, by his mother, after Perseus, Zeus' demigod son, and therefore Percy's cousin, who battled against Medusa, cutting off and collecting her head, which Percy also does. Perseus then gives the head to Athena, Annabeth's mother, who places it on her shield, the Aegis.