You're right. What you hear is "rawaadun" - the name (rawaad) with an ending (un). The ending -un (optional in writing, represented as double damma, i.e. two short u's) is a feature of Standard Arabic and usually denotes Nominative Case (Subject Case) of indefinite nouns. It also appears with (some) proper nouns. The problem hasn't been mentioned in the grammar section so far but the -un can be regularly heard in the recordings.