Iana sits next to 5 phonetic neighbors — Iana, Joanna, and Ivana are the closest matches by sound. Most share Iana's Slavic cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"God is gracious, God is merciful"
"grace, tenderness"
"eternal blossom, blooming flower"
"gift of God (short for Theodore/Theodora)"
"made of steel"
"beloved, friend"
"arrogant, haughty"
"like coral, sea-born beauty"
"heavenly peace"
"male deer, hart"
"nobility, of noble descent"
"woodland clearing with hares"
"supplanter, one who follows at the heel"
"little meadow, dear clearing"
"pearl"
"healing herb, health"
"one from the hollow or nook"
"briar rose (fairy tale association)"
"halo of moonlight"
"raven"
"holding firm to goodness (feminine of Darius)"
Similar sound: These names share phonetic patterns with Iana — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew via Romanian origins, giving them the same cultural heritage as Iana.
Rhythm: Iana is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.