Gwendolyn sits next to 4 phonetic neighbors — Gwen, Guinevere, and Madelyn are the closest matches by sound. Most share Gwendolyn's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"fair bow, white arc"
"will helmet"
"divine grace, lake"
"altar of God, hearth of God"
"noble, kind"
"forest, wood"
"young green plant, fresh growth of spring"
"high-born chief of the heavens"
"Jerusalem (poetic)"
"youthful, downy"
"of the elm grove"
"descendant of Riagan"
"bright, shining light"
"heavenly, of the sky"
"oath of God"
"to bind, ensnare"
"queen"
"gracious, youthful"
"descendant of Caiside"
"fair, comely"
"from Magdala (high tower)"
Similar sound: These names share phonetic patterns with Gwendolyn — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Welsh origins, giving them the same cultural heritage as Gwendolyn.
Rhythm: Gwendolyn is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.