If you click on the "search" link at the top of the board, you can search for previous threads where names have been discussed.
Adriel has been discussed a few times, and this is probably the best explanation:
http://www.behindthename.com/bb/arcview.php?id=170564&board=gen
It is a Hebrew name; I would not for one minute give any credence to the idea that it's a Native American name, unless the site you found that on gives the specific language that it came from. A great many baby name sites allocate "Native American" as an origin to names they can't figure out.
♦ Chrisell ♦
All we have to decide is what to do with the time that is given us. - J.R.R. Tolkien.