According to legend, Geronimo is for St.Jerome,
patron saint of translators, librarians and encyclopedists.
It seems rather odd to me that he would be named
for a saint that has that association. There
are several stories about why the Mexicans called
him that - but the one that seems to have the longest
legs is that the Mexicans pleaded to St. Jerome to
save them during one of the times they were losing to
the Apache raider.