This is not a question that you can answer without being one-sided. So you have to decide for you self. Here's some information about the two names to help you out;
Lucia;
Meaning and History;
Popularity;
Alena;
Meaning and History;
Popularity;
That's all I could find, hope this helps.
Alena Sibil's birth name is Alena Sibilov.
Alena McConaughey's birth name is Alena Kunis.
Alena Kotoucova's birth name is Alena Roknicova.
Alena Savostikova's birth name is Alena Alexandria Savostikova.
Well i think ava is a better name but you can think lucia if you want i hope i answered the question.
Alena Vinnitskaya's birth name is Olga Viktorovna Vinnitskaya.
Alena Torganova's birth name is Elena Vladimirovna Torganova.
Alena Murray's birth name is Violet May Murray.
There is a Saint Alena but no Saint Aleena. Perhaps the name derives from Alena.
Lucia Altieri's birth name is Lucia Nasillo.
Lucia Popp's birth name is Lucia Poppov.
Alena is female name derived from Greek word ἐλένη. Means flare, bright, shining.