What is the meaning of Elk?

Any of various large species of deer such as the red deer, moose or wapiti (see usage notes).

Any of the subspecies of the moose (Alces alces, alternatively named Eurasian elk to avoid confusion with the wapiti), that occurs only in Europe and Asia.
Any moose (Alces alces), the largest member of the deer family.
Common wapiti (Cervus canadensis), the second largest member of the deer family, once thought to be a subspecies of red deer.
Sambar (Cervus unicolor).

Any of the subspecies of the moose (Alces alces, alternatively named Eurasian elk to avoid confusion with the wapiti), that occurs only in Europe and Asia.

Any moose (Alces alces), the largest member of the deer family.

Common wapiti (Cervus canadensis), the second largest member of the deer family, once thought to be a subspecies of red deer.

Sambar (Cervus unicolor).

Obsolete form of elke (common swan (Cygnus cygnus, syn. Cygnus ferus)).

everyone; everybody

Alternative form of elke (“every”)

elk, moose (Alces alces)

Source: wiktionary.org