Kadyn sits next to 4 phonetic neighbors — Kaden, Caden, and Cayden are the closest matches by sound. Most share Kadyn's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"battle spirit, warrior"
"companion, ally"
"whole, healthy"
"eternal, hidden"
"blessed"
"modern invented elaboration of Ezra"
"vision during sleep, aspiration"
"immortal, deathless"
"strength, endurance"
"anglicization of Welsh Llwyd"
"fire, energy (sound symbolic)"
"bright, lively (Jay element)"
"immortal, divine"
"protector, helper of mankind"
"son of Lars (son of Lawrence)"
"gift of God"
"from the Isle of Bute (Bòid)"
"god of war, justice, and single combat"
"young warrior"
"new house, bright (via Xavier heritage)"
"the best, highest card"
Similar sound: These names share phonetic patterns with Kadyn — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Welsh origins, giving them the same cultural heritage as Kadyn.
Rhythm: Kadyn is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.