All or nothing.  Either keep all things available to use or get rid of all denigrating Indian references.  Willamette, Siuslaw, Modoc and all uses of all the names.  Might require a bit of doing as those names are in common use all over the state and in companies as well as schools and will only cost a billion or two to replace all the paperwork with references to the discontinued names.  Probably only take a few years and all indian references and the indians will be forgotten.