This pet form of Helena and other ena-ending names, long used as an independent name, is attracting notice again as an option both multicultural and simple. Lena was a Top 100 name from 1880 to 1920. And at 272 last year, it's now at its highest ranking since the Truman Administration.
A past inspiration might be the lovely singer Lena Horne, a contemporary one is the hot creator of and actress in Girls, Lena Dunham, another might be Game of Thrones actress Lena Headey.
Lena Grove is a simple but strong character in William Faulkner's Light in August.