Heaven only knows why a man with a strong biblical name like James wants to be a president named Jimmy. I'm certain that if he were called Charles, he wouldn't fool around that way. Charles is not so bad, but Charlie is a terrible burden to bear.
a diminutive of the male name charles; also used as a formal given name
Heceleme
a di·mi·nu·tive of the male name charles; al·so used as a for·mal giv·en name