Kiona is a place name in
Washington state, and it
may be from the Yakima for "brown hills", though
George R.
Stewart in
American Place-Names says that's "possible", not definite.
It may not matter to you, but I really doubt if there were any girls or women in the ancient Yakima culture named "brown hills." The idea of turning place names into given names is a modern one, and it wouldn't be part of most Native American cultures. Of course, people in European-American culture didn't name children things like
Brittany and
Savannah until the last couple of centuries, either.