Kalapuya was the name of a Native American tribe that once inhabited the Willamette Valley in Oregon. However, there are several synonyms and variations of the name Kalapuya that have been used in different contexts. Some of these include Calapooia, Calapooya, and Kalapooia. These variations are due to differences in pronunciation and the spelling used by different parties involved in referencing the tribe. The name Kalapuya is still used today to refer to the native people and their descendants, who continue to reside in the region and maintain their cultural heritage.