The most confusing ones that people might run into regularly are for sodium (Na) and potassium (K) since the medical conditions for having too much / too little

The most confusing ones that people might run into regularly are for sodium (Na) and potassium (K) since the medical conditions for having too much / too little of them are named after the Latin names - (hyper/hypo)natremia and (hyper/hypo)kalemia.