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I like Éliane and much prefer it to Eliana, but that could be due to familiarity. Eliana sounds like a rather princessy little girl, and Éliane sounds like a calm, intelligent adult - but the Élianes I have known are all older ladies, & the Éliane in my family is over 70.
Not sure where you are, but it might be tricky to use in an English-speaking country: it's quite likely to be confused with Elaine.