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"
"ray of light (modern association)"
"mighty in battle, strength in battle"
"born at dawn"
"climbing vine"
"amusement, playfulness"
"gracious, grace and oath of God"
"dear, beloved, darling"
"friend"
"open plain"
"of heaven, divine, celestial"
"beautiful, rosebud"
"diminutive of Margaret"
"beloved, pure"
"mounted warrior, horseman"
"grace, beloved"
"she who entangles men"
"wealth, fortune"
"taught by God"
"each of the two"
"high meadow"
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.