The spelling of the name "Eilena" is quite straightforward once you know its pronunciation. It is pronounced as [eye-LEE-nuh], with the stressed syllable on the second syllable. The two vowels in the word are the long "i" sound and the schwa sound, which is pronounced like a weak "uh" vowel. The letter "e" in "Eilena" makes the schwa sound and the "i" is responsible for the long "i" sound. So, the correct spelling for this name is "Eilena" with an "i" and an "e" creating its unique pronunciation.