The word 'wapiti' is a direct borrowing from the Shawnee language, an Algonquian language spoken by Native Americans. In Shawnee, 'waapiti' literally describes the animal's distinctive physical characteristic: its white rear end. This term was adopted into English in the early 19th century by settlers and naturalists to specifically refer to the North American elk (Cervus canadensis), distinguishing it from the European red deer. The journey from a descriptive Shawnee compound to a standardized English zoological term exemplifies how languages incorporate foreign words to fill lexical gaps for local flora and fauna.

This word is a loanword from the Shawnee language, where 'waapiti' means "white rump." It entered English as a single, unanalyzable unit.