Elena, the pan-European version of Helen has never been as popular in the U.S. as it is now--ranking at Number 139--due to the overall popularity of E-names, and to Elena's accessibility as what we might call 'exotic lite.' It is also ranking other countries as well--it is a Top 25 name right now in Austria, Italy and Spain.
A worthy namesake is Elena Kagan, Associate Justice of the Supreme Court, the fourth female to hold that position. A fictional bearer is Elena Gilbert, protagonist of The Vampire Diaries. and Elena Lincoln is a character in Fifty Shades of Grey.