Ilyanna sits next to 4 phonetic neighbors — Iliana, Eliana, and Ileana are the closest matches by sound. Most share Ilyanna's Slavic cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"the Lord is my God"
"I have light, enlightened"
"strength of the spear"
"peace"
"from the long ridge"
"bright, shining light"
"rain, refreshment"
"chosen, cherished"
"from the Brie region of France"
"ray of light plus lake"
"sequence of musical notes forming a tune"
"vale, lowland"
"descendant of the king"
"northeast wind"
"light (modern interpretation)"
"hare meadow"
"treetop, summit"
"beautiful, flourishing"
"noble and devoted to God (possible interpretation)"
"glowing; warm fire remnant"
Similar sound: These names share phonetic patterns with Ilyanna — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew via Slavic origins, giving them the same cultural heritage as Ilyanna.
Rhythm: Ilyanna is a 4-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.