Kayce sits next to 4 phonetic neighbors — Casey, Kasey, and Kacey are the closest matches by sound. Most share Kayce's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"alert, watchful, vigilant"
"from the castle, place near the ditch"
"divine messenger"
"God is salvation, Yahweh saves"
"invented modern combination name"
"bold warrior"
"noble and ready"
"altar/hearth of God"
"greatest, largest"
"good, blessing"
"son of Benedict/Benjamin"
"substitute, replacement"
"swift, alert"
"firebrand"
"beauty, grace, excellence"
"strong lord, powerful chief"
"modern American creation"
"clay settlement, clay worker"
"who is like God"
"deep valley; hollow valley"
Similar sound: These names share phonetic patterns with Kayce — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Irish Gaelic origins, giving them the same cultural heritage as Kayce.
Rhythm: Kayce is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.