Jacinda sits next to 3 phonetic neighbors — Lucinda, Belinda, and Jacinta are the closest matches by sound. Most share Jacinda's Spanish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"hyacinth flower"
"graceful meadow"
"slender, beautiful"
"fair one, bright hero"
"yellow, fair-haired"
"new, fresh start"
"rose, beautiful rose"
"faith, faithfulness"
"sun, throne"
"princess"
"God's gift"
"beloved lake; sea of bitterness + lake"
"of noble birth"
"little lake"
"pearl"
"olive tree"
"the other Aenor"
"enduring inheritance, what is left behind"
"hillock, knoll"
"pure, beautiful"
"of or relating to heaven, divine"
Similar sound: These names share phonetic patterns with Jacinda — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek Hyakinthos origins, giving them the same cultural heritage as Jacinda.
Rhythm: Jacinda is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.