Gwyneth sits next to 3 phonetic neighbors — Gwendolyn, Guinevere, and Winnifred are the closest matches by sound. Most share Gwyneth's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"white, fair, blessed"
"most holy"
"noble kind"
"dark, dark-complexioned"
"alert, awake"
"beautiful clearing"
"eternal, long-lived (via Amara)"
"goddess, divine"
"pearl"
"fairy queen"
"light, illumination"
"faithful, good"
"heavenly, of the sky"
"my people, close to God"
"sea (via Kai)"
"favored, kind"
"pure"
"slender and fair"
"Geirr's island"
"ancient, enduring"
"modern variant of Amy, the beloved"
Similar sound: These names share phonetic patterns with Gwyneth — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Welsh origins, giving them the same cultural heritage as Gwyneth.
Rhythm: Gwyneth is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.