What was the language of Charn like? We know it wasn’t English, because when Digory scans the description on the bell in the Hall of Images, the letters re-arrange themselves into something he can read. (Somehow, Jadis has no trouble speaking English!)
So, I made up a language for Charn, a little Assyrian, a little Latin, a little what-the-hell. Female names end mostly with -is, -a, -ara, and -alas; male names with -eus, -eul, -en, and -et. It’s a harsh-sounding language, with lots of snakelike S’s, and pn-, kn-and mn- combinations like ancient Egyptian.