Ari
This short form of Ariel stands up better as a male name than its progenitor does. It is also short for Aristotle, as in Onassis, and is a prominent character on TV's "Entourage"--the uberagent Ari Gold.
Among other prominent bearers have been Ari Fleischer, White House Press Secretary for President George W. Bush and Ari Emanuel, powerful talent agent and possibile inspiration for Ari Gold.
Ari Ben Canaan is the main character in the Leon Uris novel Exodus, played by Paul Newman on screen and Ari is the name of one of the Tenenbaum sons in "The Royal Tenenbaums."
Ari
Still mostly a boys' name, but works well for girls too.

