Kaesyn sits next to 5 phonetic neighbors — Mason, Jason, and Kaysen are the closest matches by sound. Most share Kaesyn's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"brave in battle (via Casey etymology)"
"ruler of the spear"
"slender"
"to be, to exist, present"
"willow tree, graceful and flexible"
"goodness, benevolence"
"of the earth"
"future, what is yet to come"
"brave in war"
"from Arcy (place name)"
"God supports, God heals"
"city of fashion and elegance"
"the unseen"
"hospitable"
"victorious"
"new house"
"bright fame"
"god of justice"
"the cleansing one, the rinser"
"realm, dominion"
"prince, ruler"
Similar sound: These names share phonetic patterns with Kaesyn — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Irish origins, giving them the same cultural heritage as Kaesyn.
Rhythm: Kaesyn is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.