I see but the 2 sites you are referring to are either pointing back to or a cut an paste of the Wikipedia article so this is the same info in triplicate. The name I have is #2 on the Wikipedia article (Geert Adriaans Boomgaard) but also mentioned on this 2 sites which are not a copy of the Wikipedia article:
http://www.facebook.com/topic.php?uid=5532255771&topic=15204 and
http://derniersveterans.free.fr/napoleon1.html. So difficult to say which one is right for sure. When searching I also came across the following book on this very topic (I will order it since it looks pretty cool). If you look at one of the pages displays (see pics from the above link), this one shows in alphabetic order the veterans' names and Jean Adrin in not on the A list. Anyway it's amazing how long these people lived given what happened during this time period and the hardship they went through...Thanks!