Casey sits next to 4 phonetic neighbors — Kasey, Cassie, and Katie are the closest matches by sound. Most share Casey's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"vigilant, watchful"
"rising, ascending"
"of heaven, divine, celestial"
"little rose"
"wise, knowledgeable"
"maiden, daughter"
"pure, virginal"
"princess, noble lady"
"gracious, full of grace"
"one who lives near the castle outer wall"
"strong clearing"
"gifted, beautifully unique"
"invented, sound-based name"
"my God is gracious"
"calming, soothing (by association with the herb)"
"pure, precious gem"
"prince or chieftain's daughter"
"black gemstone with white bands"
"holly tree settlement"
"harmful spirits, demons"
"woodland clearing"
Similar sound: These names share phonetic patterns with Casey — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Irish Gaelic origins, giving them the same cultural heritage as Casey.
Rhythm: Casey is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.