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"
"unity, excellence, number one"
"God has given"
"hall, noble"
"from the Isle of Bute (Bòid)"
"son of the sea (via Dylan influence)"
"praised by God (theophoric construction)"
"blessed one"
"slender, narrow"
"tail, conclusion"
"powerful ruler of the household"
"modern blend of Ty + Reese"
"king of the gods (Roman pantheon)"
"fire, energy (sound symbolic)"
"the immortal self"
"help, strength"
"curly-haired"
"son of the spear-ruler (Gerald = Geirald)"
"invented modern name, no classical meaning"
"battle, fighter"
"mythical griffin creature"
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.