I don't think I've ever heard that.

I can think of some exceptions to the rule....

el agua..this is done so that you don't have two a's together. When it is plural, it becomes las aguas

El Papa...is The Pope. la papa is a potato.

Then, there are several that end in e
madre, padre...but it's always la madre and el padre.

>La mano comes to mind.
>