I’ve always called it the Heel, and so does everyone I know.
The only alternative name for it I’ve come across is from the book Family Words, where a woman volunteered that she called the “Bunce”, a word she said she made up so as to have something nicer than “Heel” to call it.
I make croutons out of my “heels”, or little pizza’s. I save about a weeks worth, -we go through 5 loaves a week at least, and on saturday, I make any different kind of pizza’s, from traditional to dessert–the “crusty” part of the heel is on the bottom, and it won’t leak! REALLY GOOD!
I discovered this several years ago myself. I found it to be a regional thing. I’ve always called it the heel (I’m originally from Oklahoma). A good friend of mine from Pennsylvania always called it the crust.
E3
As for bread: I call it the crust on a loaf of sliced bread and the heel or the butt on a baguette style bread, mostly depending on who I’m talking to or who is around me at the time. Sometimes I’ll even simply call it the ends… I’m not very consistent!