• xaddoan,
• vaddoan,
• faddoan,
• daddoan,
• czddoan,
• csddoan,
• cwddoan,
• cqddoan,
• casdoan,
• caxdoan,
• cacdoan,
• cafdoan,
• cardoan,
• caedoan,
• caddon,
• ceddoan,
• cadan,
• cadon,
• Cadowan,
• coddan

• Cayetano,
• cattaneo,
• catania,
• cadden,
• Cadena.

The adjective form of the word "Caddoan" is "Caddoan". For example, you can say "Caddoan culture" or "Caddoan tribes". It describes something related to the Caddo people or their language.

The plural form of "caddoan" is "Caddoans".

The singular form of the word "caddoan" is "Caddoan".