Kaycee sits next to 4 phonetic neighbors — Casey, KC, and Kacey are the closest matches by sound. Most share Kaycee's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"vigilant in war, son of Cathasach"
"narrow strait (from Kyle)"
"salt"
"crooked nose (old Gaelic nickname)"
"cheerful, jovial"
"supplanter, one who follows at the heel"
"little barrel"
"cross, the cross of Christ"
"lawman, legal authority"
"gray-haired one from the valley"
"place name: from Kelton"
"son of Rhys, son of the ardent one"
"one who sails, mariner"
"modern invented name"
"village by the street"
"God is my justice"
"God has helped"
"variant of Jason (healer) or Jacob (supplanter)"
"hunter, one who hunts or pursues"
"honoring God"
"eastern town"
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 Gaelic 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.