Although the information at
http://tr.im/CdMq states that this individual and his father were born in France, Vaun is not a French name. This is evidenced by the fact that there was only one person born there in the last 120 years as you can see at
http://tr.im/CdNa. Moreover, the name Vaun can be traced in England back to the 1400s so it almost certainly originated there.