Dilan sits next to 3 phonetic neighbors — Dylan, Dillan, and Dillon are the closest matches by sound. Most share Dilan's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"son of the sea, great tide"
"passionate, fiery one"
"excellence, adornment"
"steadfast, firm"
"God will add, God will increase"
"one who is praised"
"beloved"
"saved, rescued"
"son of Neil, son of the champion"
"ardent lord"
"great town"
"God is gracious"
"little rock, harmony"
"royal ruler"
"praiseworthy, highly commended"
"sea-born, born of the sea"
"prince, commander, ruler"
"the pure and selected"
Similar sound: These names share phonetic patterns with Dilan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Welsh origins, giving them the same cultural heritage as Dilan.
Rhythm: Dilan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.