Cayce sits next to 4 phonetic neighbors — Casey, Kasey, and Kacey are the closest matches by sound. Most share Cayce's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"brave in battle, vigilant"
"son of Ben, son of the right hand"
"battle camp"
"one million million (10^12)"
"bridge town"
"beloved son"
"the meadows, fertile plains"
"son of the brave, warrior"
"bold undertaking; risky journey"
"son of God-peace"
"rye clearing"
"son of Brayden"
"river"
"edge of a shield"
"place by the lake"
"far-sighted, young (if from Cyrus)"
"pasture in a marsh"
"cup, chalice"
"God is gracious (via Sean)"
"wonder, miracle, something astonishing"
"appointed by God"
Similar sound: These names share phonetic patterns with Cayce — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Irish Gaelic O Cathasaigh origins, giving them the same cultural heritage as Cayce.
Rhythm: Cayce is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.