Cassidy sits next to 5 phonetic neighbors — Cassandra, Cadence, and Callie are the closest matches by sound. Most share Cassidy's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"curly-haired"
"lion, lion of God"
"sea of bitterness"
"smiley, cheerful (derived from nickname)"
"clean, unsullied"
"great one, month of May"
"song thrush, songbird"
"fairy, enchantment"
"sunny, radiant"
"victory of the people"
"sparkle, glitter"
"pure, maiden"
"broken land"
"my God has answered"
"to praise; to exalt"
"to open (spring)"
"descendant of the fire god"
"descendant of Riagan"
"entire, all-encompassing"
"faith"
"olive tree, peace"
Similar sound: These names share phonetic patterns with Cassidy — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Irish origins, giving them the same cultural heritage as Cassidy.
Rhythm: Cassidy is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.