PatH, yes so far.
No M's.
I am surprised that no none knows this. The character is not common today, but the books are still available; most are out of print. Aside from the series, there was a board game and at least one silent movie short. There used to be a restaurant in Columbia, CA named after the character.
B I __ __ __
__ H I __ __ E R __
T H E
A U T O B I O G R A P H Y
O F A
G O A T
Letters used: A, B, E, F, G, H, I, M, O, P, R, T, U