Answer:

willie

Answer	Crossword Clue
WILLIE	"Hobo music" singer Boxcar ...
WILLIE	Mays of baseball
WILLIE	One of the Nelsons

WILLIE	Shoemaker on a horse
WILLIE	Boxcar ... of "hobo music"
WILLIE	Big name in Giant history
WILLIE	"Steamboat .." (historic cartoon)
WILLIE	Maugham, to his friends.
WILLIE	Maugham's nickname.
WILLIE	Mays.
WILLIE	A Nelson

WILLIE	Jockey Shoemaker
WILLIE	"Steamboat ...," first Mickey Mouse cartoon
WILLIE	TV host Geist