As long as Omie never moves to South
Africa, it'd be fine! But, the Afrikaans word for Uncle is Oom and its diminutive is Omie. With that exact spelling, though a different sound - the double-o in oom sounds like a speeded-up Oo-er, silent r, and the o in omie is the same; so, OO-er-me. Which might cause a few stifled giggles ...