Daylin sits next to 3 phonetic neighbors — Daelyn, Daylon, and Dylan are the closest matches by sound. Most share Daylin's American English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"bright day, day's light"
"sword"
"of the sea (via Marius)"
"Brook land, land by the brook"
"powerful leader"
"from Devon, the deep valley people"
"son of the famous ruler"
"relating to flight, skyward"
"of Mars, warrior"
"the best, highest card"
"from the swampy land"
"son of Diot, follower of Dionysus"
"of divine origin"
"tumult, riot"
"mythical griffin creature"
"chess castle piece"
"help, strength"
"enlightened rice (kanji: 悟飯)"
"son of the third, third-born's son"
"one who works with ropes and rigging"
"older, senior in wisdom"
Similar sound: These names share phonetic patterns with Daylin — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have American English origins, giving them the same cultural heritage as Daylin.
Rhythm: Daylin is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.