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"
"narrow valley, mountain valley"
"lord, master"
"elaboration of Ahmad (most praised)"
"praised by God (theophoric construction)"
"powerful ruler of the household"
"settlement by the bridge"
"enlightened rice (kanji: 悟飯)"
"remembered by God"
"speckled, variegated"
"friend of warriors"
"third son"
"leopard, swift and agile"
"of love"
"wisdom and fire (fictional Fire Nation general)"
"stone of the flank (kidney healing)"
"son of Madoc, fortunate"
"lord, elder"
"blond, yellow-haired"
"curly-haired"
"Sacred to Juno"
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.