[peterevans]

The original magic system from Final Fantasy 1 (you can only cast N spells per magic level, maximum of 9) is a copy of the system from Wizardry. The only difference you have to type the spell name to cast it in Wizardry, and you get a menu in Final Fantasy.

[djur]

The FF1 spell list is more directly derived from D&D, though. It even has the Power Words. The sense I've gotten from reading about the development of FF is that the dev team had varied experience with existing RPGs, so the game ended up as a mixture of derivative and original ideas. (The face-to-face side view in combat was apparently inspired by football!)