Katie sits next to 4 phonetic neighbors — Katy, Catie, and Katey are the closest matches by sound. Most share Katie's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"pure, clear"
"ugly-headed (original Gaelic)"
"laurel, victory crown"
"defender of men (from Alexandra)"
"lily flower, pure"
"superiority, excellence"
"beloved, wished-for child (from Hebrew Miriam via Mary)"
"birdlike, of the birds"
"peace, world"
"caring, without superior"
"honor, victory"
"from Massy, Normandy"
"of noble birth"
"island of goats"
"beloved"
"beautiful ray of light"
"successful"
"meadow clearing, heath clearing"
"star"
"of Mars, warlike"
"knowledge, wisdom"
Similar sound: These names share phonetic patterns with Katie — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Katie.
Rhythm: Katie is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.