It most likely has no meaning, or at the very least was some amalgamation of “Indian-sounding” words and English
Per Wikipedia
Kemosabe
Ke-mo sah-bee (
/ˌkiːmoʊˈsɑːbiː/; often spelled
kemo sabe,
kemosabe or
kimosabe) is the term used by the fictional
Native American sidekick
Tonto as the "
Native American" name for the
Lone Ranger in the American television and radio programs
The Lone Ranger. Derived from
gimoozaabi, an
Ojibwe and
Potawatomi word that may mean 'he/she looks out in secret',
[1] it has been occasionally translated as 'trusty scout' (the first
Lone Ranger TV episode, 1949) or 'faithful friend'.
[2]
Jim Jewell, director of
The Lone Ranger from 1933 to 1939, took the phrase from Kamp Kee-Mo Sah-Bee, a boys' camp on
Mullett Lake in Michigan, established by Charles W. Yeager (Jewell's father-in-law) in 1916.
[3] Yeager himself probably took the term from
Ernest Thompson Seton, one of the founders of the
Boy Scouts of America, who had given the meaning "scout runner" to
Kee-mo-sah'-bee in his 1912 book
The Book of Woodcraft and Indian Lore [Wikidata].
[4]
Kamp Kee-Mo Sah-Bee was in an area inhabited by the
Ottawa, who speak a language that is mutually comprehensible with
Ojibwe. John D. Nichols and Earl Nyholm's
A Concise Dictionary of Minnesota Ojibwe defines the Ojibwe word
giimoozaabi as 'he peeks' (and, in theory, 'he who peeks'), making use of the prefix
giimoo(j)-, 'secretly'; Rob Malouf, now an associate professor of linguistics at
San Diego State University, suggested that
giimoozaabi may indeed have also meant scout (i.e., 'one who sneaks').
[5]