Cristiano Ronaldo

Today, I was allowed to leave work early, so I surprised Kevin by showing up at his school a couple hours before his day was over.  While I was there, I sifted through some papers on his desk and found this one, a true gem, which was drawn by one of Kev's after school English Club kids.  I'm just wondering, I know Cristiano Ronaldo plays soccer, but who exactly is RonaRdo?