boy name sound ok? need a middle

Km
Hi guys,
I've had so much trouble thinking of a name for my baby boy.  Right now the only name I love is Ollie, but I don't really want to use Oliver.  Do you think it's ok to just use Ollie on the birth certificate?  I know that it's not a "grown up" or "professional" name, but it's 2017 and I figure that stuff doesn't matter so much anymore! Any ideas for a middle name? Last name Dupre (Pronounced 'do prey')