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How about asking your parents first? Otherwise, it could be from Lana with a the prefix De. I am not sure what Lana means though. On this site, it says it is short from Alana or Svetlana, but my accounting professor's first name is Lana (pronounced lah-nah) and she is middle-Eastern (will not say exactly from where :(. So my guess is, Lana could be short from a middle-eastern name as well.
Hope this helps a little