Gwen sits next to 4 phonetic neighbors — Gwyneth, Quinn, and Wren are the closest matches by sound. Most share Gwen's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"white, fair, pure, blessed"
"son of the marsh dwellers"
"unique one"
"strong, manly"
"holy, blessed"
"noble kind, of noble birth"
"powerful home-ruler"
"paradise, garden of heaven"
"victory of the people"
"hope and assurance"
"narrow channel"
"flowing, streaming"
"pure, chaste"
"sun"
"may God protect"
"candle maker, candle merchant"
"my God is an oath"
"precious gem"
"holy bridge place"
"ancient one"
"my God is Yahweh"
Similar sound: These names share phonetic patterns with Gwen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Welsh origins, giving them the same cultural heritage as Gwen.
Rhythm: Gwen is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.