I would read it as KO-EN, not KOON for starters, so there may be issues there. It's a neat name though.
I don't know anyone with the name.
It's quite short, so maybe a long mn?
Koen AlexanderKoen NicholasKoen RobertKoen ViktorKoen LewisKoen WilliamKoen EdwardKoen EverettKoen ThomasKoen IsidoreKoen DanielKoen LouisKoen GeorgeKoen ErasmusKoen Terrence
Like any, or any inspiration?