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If you want a name made up out of whole cloth, "Idaho" is one.
For years it was claimed that it was derived from an Indian
phrase, "Ed-da-how," meaning "Light on the Mountains," but that
has been proven spurious. (No one can find an Indian language
with that phrase).  "Idaho Place Names" by Lalia Boone (1988) says
the name Idaho was first applied to Idaho Springs, Colorado, in
1859.  I have heard that the earliest proponents of the creation
of the Colorado territory wanted it named Idaho, but Congress
chose "Colorado" instead, and the name "Idaho" was only resurrrected
a few years later when Idaho was created (1863).
    Alan Virta, Boise State University Library (Idaho)
      Special Collections Department      [log in to unmask]