Daylan sits next to 4 phonetic neighbors — Dylan, Daylon, and Dillon are the closest matches by sound. Most share Daylan's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"born from the ocean, son of the sea"
"sky god, shining deity"
"defender of men"
"new (as prefix in Punjabi names)"
"with melody, melodious"
"of love"
"search, journey, adventure"
"Ella's hill, Elli's hill"
"sea of bitterness, drop of the sea"
"creative combination name"
"the hardest gemstone, invincible"
"Sacred to Juno"
"lord, master"
"son of a nobleman (variant interpretation)"
"universe, cosmos"
"pointed hill, peaked summit"
"eagle friend"
"forest friend, house friend"
"settlement on a Roman road, farm on the paved way"
"lord of the marches, march warden"
"Lukes town"
Similar sound: These names share phonetic patterns with Daylan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Welsh Celtic origins, giving them the same cultural heritage as Daylan.
Rhythm: Daylan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.