Casey sits next to 3 phonetic neighbors — Kasey, Lacey, and Macy 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
"appointed by God"
"battle"
"letter J, initial name"
"strength, force"
"divine, god-like"
"handsome; fair one"
"money box, treasury"
"Christmas, born on Christmas"
"river that swallows all rivers"
"rest, repose"
"Yahweh has strengthened"
"house builder, craftsman"
"wealth, fortune, prosperity"
"my messenger, my angel"
"rich protector"
"woodcutter, carpenter"
"of the forest, wood-dweller"
"one who transports goods by cart"
"God prevails; God persists"
Similar sound: These names share phonetic patterns with Casey — similar vowel sounds, consonant clusters, or rhythm.
Rhythm: Casey is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.