Analyzing the nomenclature, "Jio" would correspond to "body" (individual or object) and not healing.
There are spells with this term and have other effects:
- "Ora Norojio" (Momon), whose effect slows the body of individuals or objects.
- "Jio Ra Zerudo" (Koruru) and "Jio Ra Shudoruku" (Umagon): They are exclusive spells of cards and video games, but they are not official manga. However, it is known that the "Ra" is the projection towards the objective (example: "Giga Ra Seushiru"), therefore, "Jio" would be "body", giving meaning to these spells since they are "body projections".
- These 3 spells have the similarity of having a relationship with "bodies".
Understanding that "-ruku" is a suffix that means: improve, alter, transform or generate an effect on the body; in the case of Danny, his spell "Jioruku", would be understood as "Repeat body" or "Reset body", allowing it to return to its original state, recovering from anything that has physically affected it.
"Jio" would make more sense for all spells where this term appears, while, "-fo" ("Raifojio" and "Saifojio"), would correspond to support or assistance.