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)"
"noble army woman"
"precious gem"
"dark beauty"
"laurel tree"
"to be strong, to be healthy"
"noble kind, of noble birth"
"loved, valued"
"lioness"
"little rose"
"noble, kind (derived)"
"desire, wish"
"joyful"
"to open (spring)"
"foreign riches"
"alluring, enchanting"
"God is my strength"
"elf ruler"
"adventurous peace"
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.