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"
"crown, wreath of victory"
"vision during sleep, aspiration"
"wave"
"sea of bitterness, drop of the sea"
"descendant of the shouter (herald)"
"God has given"
"Great, magnificent, venerable"
"modern creative name blend"
"the blessed one"
"vineyard, fruitful field"
"anglicization of Welsh Llwyd"
"son of the famous ruler"
"defender of men (short for Alexander)"
"oak tree ford"
"sadness, melancholy"
"wisdom and fire (fictional Fire Nation general)"
"gift of God"
"resolute protector (from Liam/William)"
"dark as a raven"
"son of the reeve, estate manager"
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.