Kay sits next to 3 phonetic neighbors — Kai, Cay, and Kae are the closest matches by sound. Most share Kay's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"rejoice; pure"
"ford near a landing stage or wharf"
"flower"
"state of being free, liberty"
"Little red one"
"one who bakes bread"
"character name meaning transformation and power"
"divine flame, light of the Lord"
"of Julius, born in July"
"distinctive creative formation"
"of the angel, from Angelo's family"
"mountain village; reason of the mountains (Japanese interpretation)"
"creative combination name"
"divine strength"
"road by the waterfall"
"oak grove"
"immortal"
"pure, innocent"
"dear, precious one"
"bold confidence, striking presence"
Similar sound: These names share phonetic patterns with Kay — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Kay.
Rhythm: Kay is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.