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)"
"race of women"
"noble, of noble birth"
"alive, full of life"
"noble, of noble kind"
"olive tree"
"defender, helper"
"flourishing, prosperous"
"entire, all-encompassing"
"white or bright settlement"
"renowned in battle"
"defender of the people"
"graceful beauty"
"of Mars, warlike"
"tower, high place"
"to be strong, to be healthy"
"divine messenger"
"noble, nobility"
"reborn"
"gift of God (short form of Dorothea)"
"alluring, enchanting"
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.