I've actually seen "Charles Martinee" on more occassions other than this album (including
various staff credits from the N64 era). What I'm guessing here with the Martinet - Martinee derivation is just that this is a case for Engrish (or bad romanization of the katakana チャールズ・マーティネー, "Chāruzu Mātinē"), and a lack of supervision of overseas staff who could be aware of the name being wrongly written.