• kalapuya,
• jalapuyan,
• malapuyan,
• lalapuyan,
• oalapuyan,
• ialapuyan,
• kzlapuyan,
• kslapuyan,
• kwlapuyan,
• kqlapuyan,
• kalapuyn,
• kalapuyen,
• Kalupuya,
• Kalapoya,
• Kalupuyan,
• Kalupoyan,
• Kalapoyan,
• Kalupuyen,
• Kalapoyn,
• Kalupuyn

• kalapooian.

The adjective form of the word "Kalapuyan" is "Kalapuyan". It remains the same in its adjective form.

The plural form of "kalapuyan" is "kalapuyans".

The singular form of the word "kalapuyan" is "kalapuya"