Alana, in all its various spellings, was at one time reserved for daughters of dads named Alan, but is now much more widespread, ranking at Number 182. It came into prominence via model/actress/celeb spouse Alana Hamilton Stewart.
Also spelled Alanna and Alannah, as in musician Alannah Myles. The variation Alanis (via singer Alanis Morissette (daughter of an Alan) sounds a bit more original. Alaina is another popular variation.