Kaycee sits next to 4 phonetic neighbors — Casey, Kacie, and Kacey are the closest matches by sound. Most share Kaycee's Irish Cathasach-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"alert, watchful"
"royal child of heaven"
"beam of light (modern association)"
"son of Matthew, gift of God"
"God is my oath, God is abundance"
"prophet, seer"
"princess, female commander"
"who is like God"
"dweller near the holly trees"
"exalted, sublime, high"
"to ascend, exalted"
"wished-for child"
"graceful beauty"
"the most beautiful one"
"God is gracious (from Juana/Joanna)"
"great one"
"morning star, Venus"
"endurance, patient suffering"
"slender, graceful, beautiful"
"from the church, basilica"
Similar sound: These names share phonetic patterns with Kaycee — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Irish Cathasach origins, giving them the same cultural heritage as Kaycee.
Rhythm: Kaycee is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.