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"
"noble ruler"
"goodness, beneficence"
"hillside meadow"
"from the raven meadow (possible)"
"friend, friendly"
"vigilant, watchful"
"bailiff, law officer, estate manager"
"noble father's daughter"
"wise, knowing"
"fair, righteous"
"reborn, born again"
"air, song, melody"
"garden of holly"
"beloved, wished-for child"
"healthy, whole (heil)"
"helpful one"
"bearer of Christ (from Christopher)"
"beloved, calm"
"exalted, noble, sublime"
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.