A small peeve

Whenever I write a function with an external wrapper and an internal recursive function (say, to add an accumulator), I can never come up with a name for the internal function that I find satisfying. This is totally picking nits, but it bugs me for all the recursive calls to be to foo/aux or foo/helper or something like that. Come to think of it, somehow the prime symbol in Haskell and ML feels more natural.