Giselle sits next to 4 phonetic neighbors — Gisele, Isabelle, and Michelle are the closest matches by sound. Most share Giselle's French-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"pledge, hostage (of good faith)"
"prosperous in war"
"divine, celestial"
"of Catherine, the pure one"
"strength, valor"
"free woman"
"divine, heavenly"
"belonging to Clement"
"noble, nobility"
"of the forest"
"bright, shining one"
"pearl"
"member of the Gauts (Germanic tribe)"
"torch, fire"
"entire, all-encompassing"
"goddess of the hunt and moon"
"goddess of the moon"
"goddess of love, fertility, and magic"
"reborn"
"emerald (gemstone)"
"of noble birth"
Similar sound: These names share phonetic patterns with Giselle — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic (gisal) origins, giving them the same cultural heritage as Giselle.
Rhythm: Giselle is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.