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)"
"youthful, downy-haired"
"emerald (gemstone)"
"famous warrior"
"God is my strength"
"noble kind"
"joyful"
"divine strength"
"mighty man of God"
"diminutive of Julia; little Julia"
"divine, heavenly"
"reborn"
"month of Aphrodite"
"noble natured"
"noble, free-born"
"divine, heavenly"
"protector of mankind"
"from Magdala, woman of the tower"
"rose festival"
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.