Zelena sits next to 4 phonetic neighbors — Selena, Helena, and Elena are the closest matches by sound. Most share Zelena's Slavic cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"green, the color of nature"
"joyful sea, ocean of joy"
"the other Aenor"
"resurrection"
"woman from Magdala"
"heavenly darkness (if Hawaiian-Greek blend)"
"modern American coinage"
"fair and slender girl"
"rival, emulator (via Camilla/Aemilia)"
"flat-topped hill"
"cinnamon, cassia tree"
"dedicated to Mars, martial"
"dark-haired, dark complexion"
"cherry fruit"
"created modern name with bright sound"
"little dark-haired one"
"lawful, according to law"
"king's meadow, royal clearing"
"victorious, triumphant"
"invented blend of Nash and Ashley"
"beam of light"
Similar sound: These names share phonetic patterns with Zelena — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Slavic origins, giving them the same cultural heritage as Zelena.
Rhythm: Zelena is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.