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 is the son of Poseidon; his mother, Sally Jackson, married a man named Gabe Ugliano when Percy was young. Ugliano was abusive towards Percy and Sally, who leaves him in The Lightning Thief.