Jacey sits next to 5 phonetic neighbors — Jacy, Jaycee, and Casey are the closest matches by sound. Most share Jacey's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"hyacinth (flower)"
"passage, adventure"
"beautiful altar"
"beautiful"
"noble meadow, noble clearing"
"queen, powerful ruler"
"little king, royal one"
"sky father, father god"
"flask of kohl (cosmetic)"
"beautiful face, beautiful appearance"
"paradise, garden of heaven"
"wonderful, marvelous"
"mercy (if from Eleanor)"
"estate of Cynsige's people"
"esteemed, beloved"
"beneficent, good"
"woman of Magdala, beloved"
"Frankish woman, free woman"
"from the highest mountain"
"honey-beautiful (mel + linda)"
"sublime, elevated"
Similar sound: These names share phonetic patterns with Jacey — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek (via Hyacinth) origins, giving them the same cultural heritage as Jacey.
Rhythm: Jacey is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.