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"
"defender of the people"
"born at dawn, of the light"
"meadow near the hill"
"hair (related to French cheveux)"
"dark, black-haired"
"small cloak (from Lena/Helena root)"
"modern melodic invention"
"dew of the sea (rosemary herb)"
"the pepper plant or its fruit"
"from the Isle of Capri"
"wide island"
"my people, close to God"
"beautiful, lovely"
"of the Kiani dynasty, noble"
"joy, happiness"
"lapis lazuli beauty"
"home strength"
"of noble birth"
"each of the two, pure"
"wise, learned"
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.