The name 'Alena' or in Poland it might be called 'Alina', means 'bright and beautiful', specifically in the Polish language.
― Anonymous User 5/15/2017
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It can be derived either from the Old High German word for "precious" or from the Irish language term "a leanbh"" or "child", in English.In Gaelic Alannah as itself is the term for "beauty" or "serenity". It's sometimes considered a feminine form of Alan.
Alena is also a variant of Helen or Helena which is usually translated as "light."
― Anonymous User 1/20/2007
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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".