Souleen sits next to 4 phonetic neighbors — Suleen, Sulien, and Aileen are the closest matches by sound. Most share Souleen's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"sun-born, child of the sun"
"fruitful, flourishing"
"Beautiful, righteous"
"meadow or clearing"
"wild, untamed, beast"
"ash tree meadow (from Ashley root)"
"sun-warmed, basking in sunlight"
"from the wood, forest child"
"ivy plant"
"one who lives near finches"
"beautiful, graceful"
"magical being"
"giver of fame, renowned gift"
"modern invented name, creative variant of six"
Similar sound: These names share phonetic patterns with Souleen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Welsh origins, giving them the same cultural heritage as Souleen.
Rhythm: Souleen is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.