Kai sits next to 4 phonetic neighbors — Kay, Kye, and Ky are the closest matches by sound. Most share Kai's Hawaiian cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"sea, ocean"
"born on Christmas Day"
"pledged to God, my God is an oath"
"son of Carr, marsh dweller's son"
"victory of the people (via Nicholas)"
"eternal blossom"
"beautiful, rosebud"
"helper, protector"
"quiet, tranquil, peaceful"
"white island"
"spring goddess (Persephone's maiden name)"
"power of the household"
"consecrated, holy"
"place of worship, sacred place"
"land of the black soil"
"noble kind"
"noble, bright"
"pure, clean"
"she who entangles men"
"lapis lazuli, sky blue"
"of heaven, divine, celestial"
Similar sound: These names share phonetic patterns with Kai — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hawaiian origins, giving them the same cultural heritage as Kai.
Rhythm: Kai is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.