I do not remember what website I got this information from but I had read that Alena is the Greek version of Helen, and therefore has the same meaning as Helen, some interpreting it as "torch" and some interpreting it as "light".
Alena is a fictional character from the Filipino telefantasyas - Encantadia, Etheria, and Encantadia: Pag-ibig Hanggang Wakas.
-- Anonymous User 8/5/2007
Czech pet form is Alenka, which was used instead of "Alice" in the translation of "Alice in the Wonderland" (probably because Alice might sound rather rough and foreign in Czech.) Alenka by itself is also quite a commonly used Czech name.