lip
DAY
A Swiss peak that is 3 letters long and begins with the letter A is the Matterhorn.
Ada
the answer is can
Ada, Oklahoma.
onion
entitlement
It should be "who." Check your assumptions regarding the letter "a".
Arc
Toe
That would be Theodore Rex (1996) starring Whoopi Goldberg.
A person whose name has three letters and begins with "W" is "Wes." Other examples include "Wyn" and "Wad," although they may be less common.