What was the name of Tonto's horse on the 'Lone Ranger' TV series?

Tonto first rode a horse named "White Feller" (White Fella/Fellah).

When the 1938 Republic movie serial The Lone Ranger was being filmed, it was thought that having two white horses would be confusing, so the producers made "White Feller" a pinto horse, presumably on the theory that, being partly white, a pinto could still be named "White Feller".

The radio series, noting that the pinto in the film had gone over well with audiences, decided that Tonto's mount would henceforth be a pinto. For several episodes, Tonto's new horse went unnamed, referred to only as "the paint horse" or simply "Paint". Eventually the name "Scout" was adopted.

Further on the name of Tonto's horse. He was named Scout in the TV series, but was apparently called White Feller in the early Lone Ranger novels. Originally, Tonto rode double with the Lone Ranger on Silver. After a publicity photo was taken of the Lone Ranger and Tonto this way, WXYZ wisely decided to give Tonto his own steed. Scout was originally supposed to be solid white like Silver, but when they made the movie serials they realized that it would make Silver less impressive that way, so Scout was changed.