Gwenyth sits next to 4 phonetic neighbors — Gwyneth, Gwen, and Gwynne are the closest matches by sound. Most share Gwenyth's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"happiness, joy"
"beautiful rose"
"dark, black-haired"
"divine understanding"
"diminutive of Mary"
"pearl"
"feminine diminutive of Charles"
"whole, industrious (variant of Emmeline)"
"pleasant wood (via Marley)"
"of the Aelian family"
"God is gracious"
"heavenly, royal, of the sky"
"defender of men"
"icy one, ice"
"precious, of highest value"
"from Lassy, Norman place name"
"bright, luminous"
"son of Matthew, gift of God"
"modern invented name combining Az- and -lynn (lake)"
"dawn, bright star"
"variant of Viviana"
Similar sound: These names share phonetic patterns with Gwenyth — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Welsh origins, giving them the same cultural heritage as Gwenyth.
Rhythm: Gwenyth is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.