Aspen nn Ash?

I was wondering, if [name]Ash[/name] can be a nickname of [name]Aspen[/name] or is it too big of a stretch? (just theorethical, not considering the name)
Really liking the name, it does rhyme with [name]Rowan[/name] and since that is one of my favourite middle names and I try to find non rhyming names but ok.